Preheat the oven to 400ºF, or set an air fryer to 390ºF.
Dry: Rub the cooked chickpeas between the layers of a clean dish towel or paper towel. Remove the skins if you have time.
Roast: Place the dry chickpeas onto a large rimmed nonstick baking sheet. Bake them for 10 minutes.Or roast them in an air fryer for 5 minutes.
Toss the plain baked chickpeas with olive oil. Bake them for about 10 minutes more, or until crispy.Or put them back in the air fryer for about 5 minutes more, or until crispy.