Prepare the chicken: Place chicken breasts between plastic wrap and pound to an even ½-inch thickness using a meat mallet. This ensures even cooking and tenderness throughout.
Set up your breading station: Arrange three shallow bowls – one with flour seasoned with a pinch of salt and pepper, one with beaten eggs whisked with water, and one with breadcrumbs mixed with ¼ cup Parmesan cheese, garlic powder, oregano, basil, salt, and pepper.
Bread the chicken: Dredge each chicken breast first in flour (shake off excess), then dip in egg mixture, and finally coat thoroughly in the breadcrumb mixture, pressing gently to adhere the coating.
Preheat your air fryer to 375°F (190°C) for 3-5 minutes. This step is crucial for achieving that immediate crisp exterior.
Spray the breaded chicken lightly but thoroughly with olive oil or cooking spray on both sides. This helps achieve that golden-brown color and crispy texture.
Air fry the chicken for 5-6 minutes on one side, then flip, spray lightly again if needed, and continue cooking for another 4-5 minutes until the internal temperature reaches 165°F (74°C) and the coating is golden brown.
Add the toppings: Spoon about ¼ cup marinara sauce over each piece of chicken, then sprinkle each with ¼ cup mozzarella and a tablespoon of the remaining Parmesan.
Return to air fryer for 2-3 minutes until the cheese is melted and bubbly. Don’t overcook or the chicken will dry out.
Garnish and serve: Transfer to plates, scatter with torn fresh basil if desired, and serve immediately while the cheese is still gooey and the coating is crisp.