Pound each cutlet between plastic wrap to ¼-inch even thickness. Season both sides with salt, pepper, and garlic powder.
Set up three shallow dishes: flour, beaten eggs, and combined panko + Italian breadcrumbs + Parmesan + Italian seasoning + garlic and onion powder. Let seasoned cutlets rest 5 minutes.
Dredge each cutlet in flour (shake off excess), dip in egg, then press firmly into the breadcrumb mixture on both sides. Rest on a wire rack.
Preheat oven to 400°F. Heat oil in a large oven-safe skillet over medium-high until shimmering. Fry cutlets in batches, 3–4 minutes per side, until deep golden brown and cooked to 165°F internal temp. Transfer to a rack or leave in the skillet.
Spoon 2–3 tablespoons of marinara onto the center of each cutlet, leaving a ½-inch border of exposed breading all around. Layer mozzarella over the sauce and sprinkle Parmesan on top.
Bake 5–7 minutes until cheese is melted and lightly browned. Broil 1–2 minutes for a more golden top. Serve immediately with fresh basil.