Set your oven to 375°F (190°C) and let it fully preheat.
Pat chicken dry. Season both sides with salt and pepper.
Set up three bowls: flour, beaten eggs, and a mix of breadcrumbs with ½ cup Parmesan. Coat each chicken breast in flour, then egg, then breadcrumbs.
Heat olive oil in a skillet over medium-high. Fry chicken 3–4 minutes per side until golden. Drain on paper towels.
Spread marinara on the bottom of a baking dish. Add chicken. Spoon more sauce over each piece, then top with mozzarella and ¼ cup Parmesan.
Bake uncovered for 20 minutes. For a browned top, broil an extra 2–3 minutes.
Top with basil or parsley. Serve hot with pasta, salad, or garlic bread.