If you're making an air fryer recipe that calls for cooking spray, don't use one like Pam. It's best to use a spritzed oil that's comprised only of oil – without propellants or emulsifiers (like lecithin). Those extra ingredients can cause sticky residue and build-up that will damage the nonstick surface of your beloved air fryer. There are a few cooking sprays you can purchase at the store that are pure oil, or you can buy your own kitchen sprayer bottle and fill it with the oils you like to use when making your air fried foods (these are the cute ones I bought).