Slice 2 Potatoes as thin as possible. You can use a knife, but we used a mandolin, to get an even thickness.
Coat a large baking tray with some Spray oil and lay out as many potatoes as possible without any overlapping. Spray each individual potato slice with some more oil and sprinkle with Sea salt and ground black pepper and Garlic powder.
Bake in the oven for 15 minutes, turning halfway through. Repeat until all the potato slices are cooked.
Notes
The key to making sure the potatoes are nice and crispy is making sure they don't overlap on the tray and not using too much oil.
Feel free to get creative with the seasoning. We just used garlic, but you could use a fajita blend or even BBQ seasoning.
To get the potatoes really thinly sliced and therefore crispy when cooked, use a mandolin.
The thinner your potato slices are, the crispier they will be. But, they will also burn quicker, so keep an eye on them.
If they aren't crispy enough for your liking, then put them back in the oven until crispier.
When mixing the oil and seasoning into the potatoes, use your hands to get everything more evenly distributed.
Try to cut your crisps as evenly as possible to ensure they all cook at the same rate.
If you are soaking them first, you need to make sure to pat them dry, otherwise they will be too wet to crisp up.