Preheat the air fryer to 380°F (193°C).
Pound the chicken breasts to an even thickness about 1/2 inch.
Mix breadcrumbs, Parmesan cheese, Italian seasoning, salt, and pepper in a dish.
Drizzle olive oil over chicken breasts in another dish.
Coat each chicken breast in breadcrumb mixture, pressing to adhere.
Place breaded chicken in air fryer basket in a single layer.
Cook for 10-12 minutes, flipping halfway through.
Remove chicken, spoon marinara sauce over each piece.
Sprinkle mozzarella cheese on top.
Return chicken to air fryer and cook 3-5 minutes until cheese melts and bubbles.
Let chicken rest for a couple of minutes before serving.