Preheat the air fryer to 375°F (190°C) for 3-5 minutes.
Prepare the tortillas: Lay one tortilla flat on a clean surface. Spread a thin layer of pizza sauce, leaving about an inch from the edge.
Add the cheese: Sprinkle about 1 ½ cups of shredded mozzarella (and any other desired cheeses) on top of the sauce.
Add toppings: Layer on your choice of toppings, such as pepperoni, bell peppers, or mushrooms.
Top with another tortilla: Place the second tortilla on top and gently press the edges to seal.
Cook in the air fryer: Place the quesadilla in the air fryer basket and cook at 375°F (190°C) for 4-6 minutes. Flip halfway through for even crisping.