Prep the Chicken: Slice chicken breasts in half to make thin cutlets. Pat dry and season with salt and pepper.
Set Up Breading Stations: Place flour in one bowl, beaten eggs and milk in another, and breadcrumbs mixed with Parmesan in a third.
Bread the Chicken: Dredge each cutlet in flour, dip in egg wash, and coat with breadcrumb mixture. Press gently so it sticks.
Fry the Chicken: In a large skillet, heat 1/4 inch oil over medium heat. Fry each cutlet 3–4 minutes per side until golden and cooked through. Transfer to a paper-towel-lined plate.
Assemble in Baking Dish: Preheat oven to 400°F (200°C). Spread 1/2 cup marinara sauce on the bottom of a baking dish. Place fried cutlets in the dish. Top each with sauce, mozzarella, and a sprinkle of Parmesan.
Bake: Bake uncovered for 15–18 minutes or until cheese is melted and bubbly.
Garnish & Serve: Top with fresh basil or parsley and serve hot.