Preheat your air fryer to 360 degrees.
Place the frozen mozzarella sticks in a single layer in the air fryer basket. Make sure they are evenly spaced. Lightly spray them with cooking spray, flip and lightly spray the other side.
Place in the preheated air fryer and air fry for 4 minutes, using tongs flip the mozzarella sticks. Continue to air fry for another 3-5 minutes.
Cook the cheese sticks until they are crispy on the outside and the cheese on the inside is melted.
Serve while warm with your favorite marinara or dipping sauce.