These easy Slow Cooker Chicken Fajitas are a real family favourite and always my go-to dinner on a busy weeknight. Chicken breast, sliced peppers and onion and fajita seasoning cook together until tender and full of flavour, with no browning or pre-cooking needed.
There are just 6 main ingredients and about 10 minutes of preparation, then the slow cooker does all the hard work. When dinner time comes around, I put the fajita chicken on the table with warm tortillas and a few bowls of toppings and everyone can build their own.
That's one of the reasons this works so well for us on busy days. Nobody has to have exactly the same dinner, and I don't have to make several different meals. One person can pile on the salsa and jalapeños while someone else can keep theirs simple with chicken and cheese.
The fajita filling itself has 33 grams of protein and 242 calories per portion, before adding tortillas and toppings, making it a filling, high-protein family meal too.
And if you call your slow cooker a Crockpot, these are Crockpot chicken fajitas too - the method is exactly the same.
Recipe update: This recipe was originally published on 6 October 2020 and was fully retested in October 2026 to check the cooking time and ingredient quantities. The original recipe still worked well, but I've expanded the instructions, tips and FAQs.
Would you like to save this post?
We'll email this post to you, so you can come back to it later!
Jump to:
- Why You'll Love These Slow Cooker Chicken Fajitas
- Recipe Overview
- Ingredients and Substitutions
- Variations
- How to Make Slow Cooker Chicken Fajitas
- How Long Do Chicken Fajitas Take in the Slow Cooker?
- Do You Need To Add Liquid To Slow Cooker Chicken Fajitas?
- How To Stop Slow Cooker Chicken Fajitas Getting Watery
- Homemade Fajita Seasoning
- What To Serve with Slow Cooker Chicken Fajitas
- Other Ways to Serve Chicken Fajitas
- Meal Prep and Leftovers
- Dannii's Top Tips
- Troubleshooting Guide
- Frequently Asked Questions
- More Fajita Recipes
- Recipe
- Feedback
Why You'll Love These Slow Cooker Chicken Fajitas
- Only 10 minutes of prep: There is no need to brown the chicken or fry the vegetables first. Everything goes straight into the slow cooker.
- Just 6 main ingredients: This is a simple recipe using chicken, peppers, onion, fajita seasoning, lime and a little oil.
- Family friendly: Keep the chicken filling fairly mild and let everyone customise their own fajitas at the table.
- High in protein: The fajita filling has approximately 33 grams of protein per portion, making this an easy protein-packed family dinner.
- Less messy than saucy fajitas: There are no chopped tomatoes or added cooking liquids in this recipe, so the finished chicken fajitas are easier to load into tortillas without lots of sauce running out.
- Easy to adapt: Use chicken breast or thighs, adjust the spice level, add extra vegetables or shred the chicken instead of chopping it.
- Great for leftovers: The cooked chicken and vegetables can be used in wraps, rice bowls, salads or on top of baked potatoes.
Recipe Overview
- Prep time: 10 minutes
- Cooking time: 3 hours on HIGH or 5-6 hours on LOW, plus 15 minutes after chopping or shredding the chicken.
- Flavour: Smoky, lightly spiced fajita chicken with sweet peppers and fresh lime.
- Texture: Tender, juicy chicken with soft peppers and onions.
- Difficulty: Very easy. Add everything to the slow cooker, leave it to cook, then chop or shred the chicken.
- Best for: Busy family dinners, build-your-own fajita nights and high-protein meal prep.
- Protein: Approximately 33 grams of protein per portion before adding tortillas and toppings.
Ingredients and Substitutions
A full ingredients list, along with US Customary and Metric measurements, can be found in the recipe card at the end of this post.
- Chicken breast - We use 600g of boneless, skinless chicken breast.
I prefer to keep the chicken breasts whole while they cook and then chop or shred them towards the end. This helps the chicken stay juicy rather than having lots of small pieces cooking for several hours.
You can use boneless, skinless chicken thighs instead if you prefer. They have a slightly richer flavour and stay particularly juicy in the slow cooker. - Bell peppers - We use a mixture of red, yellow and orange peppers because they make the fajitas colourful as well as adding sweetness.
You don't need to use one of every colour. Just use whatever peppers you have.
If you like really soft peppers, add them at the beginning as we do. For peppers with a little more bite, you can add them later in the cooking time. - Onion - Brown/yellow onion is what we use, but you could use red onion too.
- Olive oil - This helps the fajita seasoning coat the chicken and adds a little richness. We use olive oil, but another neutral cooking oil will work too.
- Fajita seasoning - Homemade fajita seasoning lets you control the salt and spice level, but there is absolutely nothing wrong with using a packet of fajita seasoning when you need dinner to be as easy as possible.
Different shop-bought blends can vary quite a lot in salt and chilli, so adjust the amount depending on the brand you use.
If you need this recipe to be gluten free, check the label on shop-bought fajita seasoning, as ingredients can vary between brands. - Lime - Fresh lime juice adds acidity and freshness and works really well with the smoky fajita seasoning.
I also like to put extra lime wedges on the table so everyone can squeeze more over their fajitas if they want to.
Variations
Make them mild - Choose a mild fajita seasoning and leave chilli flakes, hot sauce and jalapeños for the table. This is the easiest way to make one dinner work for people who like very different spice levels.
Add extra vegetables - Mushrooms and courgette (zucchini) can both be added to the slow cooker. You can also stir spinach through at the end and let it wilt into the hot fajita mixture.
Make pulled chicken fajitas - Instead of chopping the cooked chicken, shred it using two forks. This creates slow cooker pulled chicken fajitas with lots of seasoned chicken throughout every wrap.
Add more heat - Add sliced jalapeños, chilli flakes or a little extra chilli powder. I prefer putting the extra heat on the table rather than adding too much to the slow cooker, because then everyone can make theirs as spicy as they like.
How to Make Slow Cooker Chicken Fajitas
- Add vegetables: Put the sliced peppers and onion into the bottom of the slow cooker.
- Add chicken: Place the whole chicken breasts on top of the vegetables.
- Add seasoning: Add lime juice and oil.
Sprinkle half of the fajita seasoning over the chicken.
Turn the chicken breasts over and sprinkle over the remaining seasoning so both sides are coated.
- Cook: Put the lid on and cook on HIGH for 3 hours or LOW for 5-6 hours.
There is no need to add stock, water or tomatoes. The chicken and vegetables will release moisture as they cook.
- Check: Check that the chicken is completely cooked through and then lift it out onto a chopping board.
Chop the chicken into bite-sized pieces or shred it using two forks.
- Return the chicken: Put the chopped chicken back into the slow cooker and give everything a gentle mix.
- Cook for a further 15 minutes, then serve with warm tortillas and your favourite toppings.
How Long Do Chicken Fajitas Take in the Slow Cooker?
We cook these chicken fajitas on HIGH for 3 hours or LOW for 5-6 hours, then chop the chicken and return it to the slow cooker for another 15 minutes.
Chicken breasts vary in size and thickness, and different slow cookers can cook at slightly different temperatures, so use the cooking time as a guide.
For this recipe, we cooked these fajitas in a Morphy Richards 6.5L Slow Cooker.
Always check that the chicken is thoroughly cooked through before serving.
Do You Need To Add Liquid To Slow Cooker Chicken Fajitas?
No. You do not need to add stock, water or tomatoes to these slow cooker chicken fajitas.
It can seem strange when you first put everything into the slow cooker because the ingredients look quite dry, but both chicken and vegetables naturally release moisture as they cook.
One of the advantages of not adding extra liquid is that the finished fajita mixture is less saucy and much easier to spoon into tortillas.
How To Stop Slow Cooker Chicken Fajitas Getting Watery
Even without adding any water, stock or tomatoes, you may still find some liquid in the bottom of the slow cooker at the end. This is completely normal.
Chicken, peppers and onions all release water as they cook, and because a slow cooker has a tightly fitting lid, very little of that moisture evaporates.
If there is more liquid than you want, simply remove some with a spoon or ladle when you take the chicken out to chop it.
Then return the chicken and stir everything together. You can also use a slotted spoon when filling your tortillas so excess liquid stays behind in the slow cooker.
Want firmer peppers?
If you prefer peppers with more bite, add them for approximately the final 45 minutes of cooking instead of putting them in at the beginning.
This also means they release less moisture during the cooking time.
We tend to add them at the start because I like the simplicity of putting everything in and walking away, but the later method is worth trying if texture is more important to you.
Homemade Fajita Seasoning
You can make these slow cooker chicken fajitas with fajita seasoning from a packet or with homemade seasoning.
Our homemade fajita seasoning is made with chilli powder, smoked paprika, garlic, onion, cumin and coriander, giving the chicken plenty of smoky Tex-Mex flavour.
I like making a larger batch of seasoning so there is some ready for the next fajita night.
However, I also always have shop-bought seasoning in the cupboard, which is what is used in these photos.
There are days when grabbing a packet is the difference between getting dinner into the slow cooker in five minutes and abandoning the plan altogether.
If you use shop-bought fajita seasoning, check the packet instructions because the strength, salt content and chilli level can vary between brands.
What To Serve with Slow Cooker Chicken Fajitas
The easiest way to serve these is with warm flour tortillas and lots of toppings in the middle of the table.
Our usual favourites include:
- Grated cheese
- Shredded lettuce
- Sour cream or Greek yogurt
- Lime wedges
- Fresh coriander (cilantro)
- Jalapeños
- Salsa
- Guacamole
Putting everything out separately makes this such an easy family dinner because everyone can build their own.
Guacamole
Creamy avocado works really well with the smoky seasoned chicken and peppers, and I usually have to make more guacamole than I think we'll need because it disappears quickly. Try my BEST guacamole recipe.
Salsa
For a really easy salsa, try my restaurant style salsa. For something fresher and chunkier, our pico de gallo would be particularly good with these fajitas.
Sweetcorn salsa
My sweetcorn salsa is another really good option because the sweetness of the corn complements the smoky fajita seasoning. It also adds more vegetables without feeling like you've put another vegetable side dish on the table.
Rice
If you want to turn these fajitas into a bigger meal, serve them with my easy Spanish rice. This works especially well if you're feeding more people and want the chicken fajita filling to stretch further.
My cilantro lime rice is another great option and works especially well if you're serving the chicken as a fajita bowl instead of in tortillas.
Tortilla chips
Serve my air fryer tortilla chips alongside salsa or guacamole if you're making a larger Mexican-inspired spread.
Mexican coleslaw
A crunchy slaw is a really good contrast to the soft chicken and peppers. My Mexican coleslaw would work either alongside the fajitas or actually piled into the wraps.
Other Ways to Serve Chicken Fajitas
You don't have to put this chicken into tortillas. It's one of those recipes where I actually quite like having leftovers because it gives you the base of another meal without feeling as though you're eating exactly the same thing again.
Try it:
- On top of a baked potato
- Over a big salad
- In lettuce wraps
- Stuffed into a pitta
- In a quesadilla with melted cheese
- Added to nachos
- In a burrito bowl with rice, beans and salsa
If I'm making rice bowls, I usually add black beans too. They make the meal go further and add extra fibre and protein.
Meal Prep and Leftovers
Meal prep: You can get most of the preparation done the night before. Slice the peppers and onion and measure out the fajita seasoning, then keep them covered in the fridge.
Keep the raw chicken stored separately in the fridge. When you're ready to cook, put everything into the slow cooker, add the lime juice and switch it on.
I prefer doing it this way rather than leaving the ingredients sitting in the slow cooker insert overnight. It means there is very little to do when the afternoon is already looking busy.
Fridge: Allow leftover chicken fajita filling to cool and put it into an airtight container. Store it in the fridge for up to 2 days. Reheat thoroughly in a saucepan or microwave until piping hot.
Freezer: Allow the cooked chicken and vegetables to cool completely and portion them into freezer-safe containers. Freeze for up to 3 months.
Defrost overnight in the fridge and reheat thoroughly until piping hot. Freeze just the chicken and vegetable mixture rather than assembled fajitas.
Fresh toppings such as lettuce, sour cream and guacamole are much better added after reheating.
Dannii's Top Tips
- Keep the chicken breasts whole while they cook and chop or shred them afterwards. This helps the chicken stay juicy.
- Don't add stock, water or tomatoes. The chicken, peppers and onion release enough moisture while they cook.
- If there is excess liquid at the end, ladle some out before returning the chicken to the slow cooker.
- Use a slotted spoon when putting the filling into tortillas if you want to keep them from becoming soggy.
- For firmer peppers, add them for the final 45 minutes rather than at the start.
- If ease is the priority, add the peppers at the beginning and let everything cook together.
- Frozen sliced onions are a useful shortcut on especially busy days.
- Homemade fajita seasoning gives you control over salt and spice, but packet seasoning works perfectly well.
- Warm tortillas before serving. They become softer and much easier to fold.
- An extra squeeze of lime just before serving really freshens everything up.
- Fresh coriander (cilantro) is a great finishing touch if your family likes it.
- Put spicy toppings such as jalapeños and hot sauce on the table rather than adding them to the whole dish.
- Serve all the toppings in separate bowls and let everyone build their own fajitas.
- If you have leftover fajita chicken but not enough for another full dinner, add black beans and rice to stretch it further.
Troubleshooting Guide
| Problem | Likely cause | Fix |
|---|---|---|
| The fajita mixture is too watery | Chicken, peppers and onions naturally release moisture as they cook, and very little evaporates from a slow cooker. | Ladle out some of the excess liquid before returning the chicken, and use a slotted spoon for serving. For less liquid next time, add the peppers for the final 45 minutes. |
| The chicken is dry | The chicken breasts were smaller or thinner, or they cooked for too long. | Slow cookers vary, so start checking the chicken earlier if your breasts are small. Remove it as soon as it is completely cooked through. Chicken thighs are also a more forgiving option. |
| The chicken won't shred easily | The chicken breasts are particularly thick or haven't cooked for long enough. | Continue cooking until the chicken is completely cooked through and tender enough to pull apart easily with two forks. |
| The peppers are too soft | They were added at the beginning and cooked for the full cooking time. | Add the peppers for approximately the final 45 minutes next time if you prefer them to retain more bite. |
| The fajita chicken tastes bland | Your fajita seasoning is particularly mild, or its flavour has been diluted by liquid released during cooking. | Stir through a little more fajita seasoning when you return the chicken for the final 15 minutes, then finish with an extra squeeze of lime. |
Frequently Asked Questions
No, you don't need to add water, stock or any other cooking liquid.
The chicken, peppers and onions naturally release moisture as they cook.
Our recipe cooks on HIGH for 3 hours, followed by another 15 minutes after the chicken has been chopped and returned to the vegetables.
Chicken breast size and slow cookers vary, so always make sure the chicken is thoroughly cooked before serving.
Chicken and vegetables naturally release liquid when cooked, and very little moisture evaporates from a slow cooker because the lid stays on.
If there is more liquid than you want, ladle some out before returning the chopped chicken.
You can also serve the mixture with a slotted spoon.
Yes.
Packet fajita seasoning works perfectly well in this recipe.
Because different brands vary in salt, chilli and strength, use an amount suitable for the quantity of chicken according to your packet.
Yes. Boneless, skinless chicken thighs work well and make a particularly juicy slow cooker fajita filling.
Always make sure the chicken is completely cooked through before serving.
Yes.
Rather than chopping the cooked chicken breast, shred it using two forks and return it to the peppers and onions for the final 15 minutes.
You can prepare the vegetables, garlic and seasoning the night before and store them covered in the fridge.
Keep the raw chicken refrigerated separately.
Assemble everything in the slow cooker when you're ready to start cooking.
Yes.
Allow the cooked filling to cool and freeze it in a suitable airtight container for up to 3 months.
Defrost it in the fridge and reheat thoroughly before serving.
Yes.
Crock-Pot is a brand of slow cooker, so if you're looking for Crockpot chicken fajitas, you can use this exact recipe.
More Fajita Recipes
If you've tried these slow cooker chicken fajitas, let us know how you got on in the comments below.
Tag us in your creations on Instagram @hungryhealthyhappy and use the hashtag #hungryhealthyhappy too.
Recipe
Slow Cooker Chicken Fajitas
Recipe Video
Ingredients
- 600 g (1 ⅓ lb) of Chicken breast
- 3 Bell peppers - sliced
- 1 Onion - large; sliced
- 1 tablespoon of Olive oil
- 4 tablespoons of Fajita seasoning
- 1 tablespoon of Lime juice
To serve (all optional)
- Tortilla wraps
- Guacamole
- Salsa
- Sour cream
- Cheese
Instructions
- Add vegetables: Put the sliced peppers and onion into the bottom of the slow cooker.
- Add chicken: Place the whole chicken breasts on top of the vegetables.
- Add seasoning: Add lime juice and oil.Sprinkle half of the fajita seasoning over the chicken.Turn the chicken breasts over and sprinkle over the remaining seasoning so both sides are coated.
- Cook: Put the lid on and cook on HIGH for 3 hours or LOW for 5-6 hours.
- Check: Check that the chicken is completely cooked through and then lift it out onto a chopping board.Chop the chicken into bite-sized pieces or shred it using two forks.
- Return the chicken: Put the chopped chicken back into the slow cooker and give everything a gentle mix.
- Cook for a further 15 minutes, then serve with warm tortillas and your favourite toppings.
Recipe Notes
- Keep the chicken breasts whole while they cook and chop or shred them afterwards. This helps the chicken stay juicy.
- Don't add stock, water or tomatoes. The chicken, peppers and onion release enough moisture while they cook.
- If there is excess liquid at the end, ladle some out before returning the chicken to the slow cooker.
- Use a slotted spoon when putting the filling into tortillas if you want to keep them from becoming soggy.
- For firmer peppers, add them for the final 45 minutes rather than at the start.
- If ease is the priority, add the peppers at the beginning and let everything cook together.
- Frozen sliced onions are a useful shortcut on especially busy days.
- Homemade fajita seasoning gives you control over salt and spice, but packet seasoning works perfectly well.
- Warm tortillas before serving. They become softer and much easier to fold.
- An extra squeeze of lime just before serving really freshens everything up.
- Fresh coriander (cilantro) is a great finishing touch if your family likes it.
- Put spicy toppings such as jalapeños and hot sauce on the table rather than adding them to the whole dish.
- Serve all the toppings in separate bowls and let everyone build their own fajitas.
- If you have leftover fajita chicken but not enough for another full dinner, add black beans and rice to stretch it further.
Nutritional Information
Where nutritional information is provided, it is approximate and calculated using online tools. Values can vary depending on the ingredients and brands used, but we endeavour to be as accurate as possible.
All timings are a guide and may vary depending on the ingredients, equipment and, where relevant, the appliance used. Changing the serving size may also affect the time needed.
Beth says
My husband and I love this recipe! It's so delicious and flavorful! I can't wait to make this again soon!
Lisa | Garlic & Zest says
Fajitas sound like a great dinner for a busy weeknight. Making them in the slow cooker is so convenient too. Thanks for sharing... Heading to the kitchen now...
Emese says
I bet the chicken in a slow cooker will not be dry. Love love fajitas! More and more reasons to get a slow cooker.
Emily Liao says
Love how this was made right in the slow cooker! The texture came out perfectly.