Place the mozzarella stick halves in the freezer for at least 1 hour to help them hold their shape during cooking.
Set up three shallow dishes: flour in the first, beaten eggs in the second, and panko breadcrumbs mixed with salt and pepper in the third.
Coat each mozzarella stick evenly in flour, dip in beaten eggs, then press into the panko mixture to fully coat.
Place coated sticks in a single layer on a plate or baking sheet.
Preheat air fryer to 380°F (190°C) and lightly spray the basket with cooking spray.
Arrange mozzarella sticks in a single layer in the air fryer basket, avoiding overcrowding; cook in batches if needed.
Air fry for 6 minutes, flipping halfway through, until golden brown and crispy.
Serve immediately with your favorite marinara sauce.
