Add mozzarella, Parmesan, cornstarch and water to a large bowl. Mix well.
Roll mixture into bite sized balls (about 1 inch) and place on a parchment lined baking sheet. Freeze for 1 hour.
Add beaten eggs to a small bowl. In another bowl, stir together breadcrumbs, Italian seasoning, garlic powder and salt.
Dip cheeseballs in eggs to coat. Roll in breadcrumb mixture to cover completely and place back on the baking sheet. Put back in freezer for 20 minutes.
Remove from freezer and dip cheeseballs in egg mixture and roll in breadcrumbs again.
Preheat air fryer to 360°F. Once preheated, add cheeseballs to air fryer basket.
Shake the air fryer every couple minutes to brown evenly. Serve with pizza or marinara sauce for dipping.