Cut the chicken breasts in half lengthwise. Season with 1/4 teaspoon of salt and pepper.
Prepare your breading stations. Add the flour to a shallow bowl. In another shallow bowl, whisk together the egg and milk. In a third bowl, mix together the panko crumbs, parmesan, 1/2 teaspoon salt, Italian seasoning, smoked paprika, garlic powder and onion powder.
Coat the chicken in flour and shake off any excess.
Dip each piece of floured chicken in the egg mixture. Let any excess drip off.
Coat each piece in the panko crumb mixture, pressing the crumbs into the chicken to ensure it sticks to the egg mixture.
Spray both sides of the chicken with oil and place in your air fryer basket in a single layer. (Depending on the size of your air fryer, you may need to air fry two at a time).
Air fry on 400F for 5 minutes. Flip over and air fry for another 3-4 minutes.
Spread 2 tablespoons of marinara on each piece of chicken and top with a slice of mozzarella.
Air fry for another 2-3 minutes, or until the cheese has melted and the internal temperature of the chicken is 165F.
Notes
You can use grated or sliced mozzarella cheese. I like to buy the mozzarella ball and cut it into thick slices. Grated cheese can sometimes blow around in the air fryer, while the slices will usually stay put.
If you have a large capacity air fryer, you can air fry all 4 chicken cutlets at the same time. If your air fryer is smaller (mine is 5.8 quart), you'll want to air fry them two at a time or half the recipe. Cooking time listed is for a single batch.