Preheat the air fryer to 400℉.
Next, place the frozen mozzarella stick in the basket but make sure to give them some room. You should be able to fit at least 2 servings in one cook.
Cook the mozzarella sticks for 7 minutes and flip them halfway through.
When finished allow them to cool in the air fryer because hot, sticky cheese on your fingers aren't fun. Lastly, serve and enjoy.