Prep the chicken: Slice each chicken breast in half horizontally to create 4 cutlets. Pat dry and season both sides with salt and pepper.
Set up breading station: In one bowl, beat the egg. In another, mix breadcrumbs, parmesan, Italian seasoning, garlic powder, salt, and pepper.
Bread the chicken: Dip each piece into the egg, then press into the breadcrumb mixture to fully coat.
Air fry: Spray air fryer basket with olive oil. Place chicken in a single layer and spray the tops with olive oil.
Air fry at 375°F for 8 minutes, flip, and air fry for another 4–6 minutes until golden and cooked through (internal temp 165°F).
Add sauce + cheese: Spoon 2 tbsp marinara on each piece and top with mozzarella.
Return to air fryer for 1–2 minutes until the cheese is melted and bubbly.
I also like to add the sauce into a small pan, top with mozzarella and place in the oven till cheese is browned and bubbly. I will then pour the sauce right over the chicken.
Serve with fresh basil, over pasta, zucchini noodles, or a Caesar side salad (check out my high protein caesar dressing above).