Carefully butterfly each chicken breast horizontally to create 4 thin cutlets.
Season both sides with kosher salt and black pepper.
Place flour in a shallow bowl and season lightly with additional salt and pepper.
Beat the eggs in a second shallow bowl.
In a third bowl, combine panko breadcrumbs, Parmesan cheese, oregano, red pepper flakes, and garlic powder.
Dredge each chicken cutlet in flour, shaking off excess.
Dip into the beaten eggs.
Coat thoroughly in the breadcrumb mixture, pressing gently to help it adhere.
Preheat the air fryer to 400°F (204°C).
Arrange the breaded chicken in a single layer in the air fryer basket.
Cook for 5 minutes.
Flip and cook for another 5 minutes until nearly cooked through.
Spoon marinara sauce over each piece of chicken.
Top with shredded mozzarella cheese.
Return to the air fryer and cook for 3 additional minutes until the cheese is melted and lightly golden.
Garnish with fresh parsley and serve immediately.