Lay two tortillas out and top one half of each tortilla with cheese (and chicken, if using).
Fold each tortilla in half and spray the top with cooking spray (or brush with olive oil).
Pace each folded tortilla, sprayed side down, in the air fryer basket.
Spray the tops with cooking spray.
If you have one available, place a cooking rack or metal trivet on top of the tortillas.
Air fry at 370-degrees for 6 minutes. Flip then continue air frying for 2 minutes longer.
Enjoy.
Notes
Store leftovers wrapped in plastic or tinfoil in the refrigerator for up to 2-3 days. To reheat, place the quesadillas back into the air fryer at 350 degrees for 2-3 minutes, then flip and air fry for another 2-3 minutes or until heated through.