Prep chicken: Preheat oven to 425°F (220°C). Season chicken breasts with salt and pepper.
Dredge: Set up 3 shallow bowls—flour in the first, beaten eggs with milk in the second, and breadcrumbs mixed with Parmesan, garlic powder, oregano, and paprika in the third. Dredge each chicken piece in flour, then egg, then breadcrumb mixture.
Fry: Heat olive oil in a large skillet over medium heat. Fry chicken for 3–4 minutes per side, until golden and crisp. Transfer to a paper towel-lined plate.
Assemble: In a baking dish, spread 1/2 cup of marinara sauce. Place chicken on top, then spoon remaining sauce over each piece. Top with shredded mozzarella.
Bake: Bake uncovered for 15–18 minutes, or until cheese is bubbly and chicken is cooked through (internal temp 165°F).
Serve: Garnish with fresh basil or parsley. Serve hot with pasta or a side salad.