Preheat your oven to 180°C/160°C(fan)/350°F/Gas 4.
Put 4 slice Sourdough bread, 2 tablespoon Olive oil and 1 pinch Sea salt and black pepper in a bowl and mix well.
Spread the croutons out on a large baking tray and put into the oven for 10 minutes.
Take them out of the oven and sprinkle over 30 g Parmesan, and then put them back in the oven for 3 minutes.
Notes
If you are only making a few croutons, rather than a big batch, then you can cook them in a frying pan. Just mix all the ingredients together in a bowl and then toast them in a pan.
For a more indulgent croutons, you could use a mixture of melted butter and oil, rather than just oil.
Make sure everything is well mixed, so all the croutons are covered in oil and seasoning.
Let the croutons cool completely before serving.
Add some extra flavour by using an infused oil like garlic or chilli.