Core apples, then slice them very thin using a mandolin.
Spray inside of air fryer basket with non stick basket, lay apples inside trying to overlap them the least amount possible.
Sprinkle lightly with cinnamon or cinnamon sugar mixture.
Set to 300 degrees F and cook for 10 minutes total, flipping after 5 minutes.
Allow to cool and harden before eating.
Tip: Open basket after 1 minute and if slices are flying around in the basket you can place a metal rack or trivet on top of them to avoid that from happening.