Preheat your air fryer to 380°F (193°C).
Pound the chicken breasts to an even thickness of about 1/2 inch.
In one dish, mix together breadcrumbs, Parmesan cheese, Italian seasoning, salt, and pepper. In another dish, drizzle olive oil over the chicken.
Coat each chicken breast in the breadcrumb mixture, pressing gently to help the crumbs adhere.
Place the breaded chicken breasts in a single layer in the air fryer basket. Cook for about 10-12 minutes, flipping halfway through.
Remove the chicken from the air fryer and spoon marinara sauce over each piece, then sprinkle with mozzarella cheese.
Return the chicken to the air fryer for an additional 3-5 minutes until the cheese melts and becomes bubbly.
Let the chicken rest for a couple of minutes before serving.