Preheat the air fryer to 400°F (200°C).
Slice chicken breasts in half horizontally to create four thin cutlets and pound to an even 0.5-inch thickness.
Organize a three-stage breading station: bowl one with flour; bowl two with beaten egg; bowl three with Panko, Parmesan, garlic powder, oregano, salt, and pepper.
Dredge each cutlet in flour, submerge in egg wash, and coat thoroughly with the breadcrumb mixture, pressing firmly to ensure adhesion.
Lightly coat the air fryer basket with olive oil spray and arrange cutlets in a single layer.
Apply a light layer of olive oil spray to the surface of the breaded chicken.
Air fry at 400°F for 8 minutes.
Flip each cutlet, then top with 2 tablespoons of marinara sauce and 2 tablespoons of mozzarella cheese.
Air fry for an additional 3 to 4 minutes until the internal temperature reaches 165°F (74°C) and the cheese is fully melted and browned.
Rest for 2 minutes before serving to stabilize internal moisture.