Cut each mozzarella string cheese stick in half to make 24 shorter sticks.
Place the flour in a shallow bowl.
In a second shallow bowl, whisk together the eggs and water until well combined.
In a third shallow bowl, combine the Italian-style breadcrumbs, garlic powder, dried oregano, salt, and black pepper.
One at a time, coat each mozzarella stick first in the flour, shaking off any excess.
Then dip the floured stick into the egg mixture, ensuring it is fully coated.
Next, roll the stick in the breadcrumb mixture, pressing gently to adhere the crumbs well.
For extra crispiness and to help the coating stick, dip the stick back into the egg mixture and then again into the breadcrumb mixture for a double coating.
Place the coated mozzarella sticks on a plate or tray.
Repeat the coating process with all mozzarella sticks.
Preheat the air fryer to 390°F (200°C) for 3 minutes.
Lightly spray the air fryer basket with cooking spray.
Arrange the mozzarella sticks in a single layer in the air fryer basket, making sure they do not touch or overlap. You may need to cook in batches.
Lightly spray the tops of the mozzarella sticks with cooking spray.
Air fry at 390°F (200°C) for 6 to 8 minutes, or until the coating is golden brown and crispy. Watch carefully to prevent cheese from leaking out.
Carefully remove the mozzarella sticks from the air fryer and serve immediately with marinara sauce or your favorite dipping sauce.