Place 3 bowls on the counter. In the first bowl add the all purpose flour. In the second bowl add the egg plus 1 tablespoon of water. Whisk the egg and water. Pour the Italian breadcrumbs in the third bowl.
Unwrap the mozzarella cheese and cut each one in half.
Place a cheese stick in the flour to coat. Dip the floured cheese stick into the beaten egg, then roll the cheese stick in the breadcrumb mixture.
Place the coated cheese stick on a baking sheet lined with wax paper. Repeat the process until all of the cheese sticks are coated.
Place the baking sheet in the freezer for one hour. Do not skip this step or the cheese will melt too fast.
Once the mozzarella sticks have been frozen for at least one hour place them in the bottom of the air fryer basket.
Spray the mozzarella sticks with cooking spray and cook at 390 degrees F. for 5 minutes. Flip the mozzarella sticks half way through the cooking time and spray the other side with cooking spray.
Let the mozzarella sticks cool slightly then serve with your favorite dipping sauce.