Line a rimmed baking sheet with wax paper. Lightly beat the egg in a wide, shallow bowl. Combine the Italian seasoning, salt, and breadcrumbs in a second wide, shallow bowl.

Dip a mozzarella stick into the beaten egg and coat it completely. Dip the stick into the bowl with the breadcrumbs and coat completely. Transfer to a wax paper-lined baking sheet and freeze for 30 minutes to 1 hour.

Pull the mozzarella sticks out of the freezer, dip them into the egg and then the breadcrumb mix, and freeze them for another 30 minutes to 1 hour.

Set your air fryer to 390°F. Spray the air fryer basket and the mozzarella sticks with nonstick cooking spray. Air fry the mozzarella sticks for 6 to 8 minutes until the exterior is golden and crispy.

Remove from the fryer, cool just long enough to avoid burning your tongue, and eat immediately!