Unwrap the mozzarella string cheese and cut each stick in half.
Add the flour to a shallow bowl.
Whisk the eggs in a second bowl.
In a third bowl, combine panko breadcrumbs, Italian seasoning, garlic powder, kosher salt, and black pepper.
Coat each mozzarella stick in flour.
Dip into the beaten eggs.
Roll in the breadcrumb mixture until fully coated.
Place the coated sticks on a parchment-lined baking sheet with space between each one.
Freeze for at least 30 minutes to help prevent cheese from leaking while cooking.
Preheat the air fryer to 390°F.
Brush the Air Fryer Mozzarella Sticks lightly with olive oil or spray with cooking spray.
Arrange them in the air fryer basket in a single layer with space between each stick.
Cook for 5 minutes or until golden brown and crispy.
Watch carefully during the final minute. If cheese starts to ooze out, remove them immediately.
Serve warm with marinara sauce or your favorite dipping sauce.