Well, you can use both of them, but the key is to ensure that they do not fly around the air fryer and puncture some holes on them to allow for air circulation. If the parchment paper starts to fly around in the air fryer, it can block the air circulation and can even catch fire. If you are making something lightweight as banana chips, or apple chips, totally skip using them. But if you’re cooking something that will have dripping food into the basket, like air fryer bacon, beef, or this air fryer pear or air fryer bananas, use an air fryer parchment paper to make the cleaning chores easy.