Preheat the air fryer to 370°F (188°C).
Lightly spray the air fryer basket with cooking spray or line it with parchment paper.
Place one tortilla in the basket.
Sprinkle half of the cheese evenly over the tortilla.
Add the shredded chicken on top.
Add optional vegetables if using.
Sprinkle the remaining cheese evenly over the filling.
Place the second tortilla on top and lightly spray it with cooking spray.
Cook for 6 minutes, flipping halfway through, until golden and crispy.
Remove carefully, slice, and serve your Air Fryer Chicken Quesadilla with salsa, guacamole, or sour cream.