Line up three shallow bowls: flour seasoned with a pinch of salt and pepper, beaten eggs, and a mixture of panko breadcrumbs, grated Parmesan, oregano, and garlic powder.
Pat the chicken dry. Dredge in flour, shake off excess, dip in eggs, then press into the breadcrumb mixture until well coated.
In a large skillet, heat olive oil over medium-high heat. Fry the chicken in batches until golden and crisp, about 2–3 minutes per side. Transfer to a paper towel–lined plate to drain.
Preheat your oven to 375°F (190°C). Spoon a thin layer of marinara into a baking dish.
Place the fried chicken in the dish. Top each piece with more marinara, then slices or shreds of mozzarella.
Bake for 15–20 minutes, until the cheese is melted and bubbly and the chicken reaches a safe internal temperature. If you like, turn on the broiler for 1–2 minutes to finish with a bubbly, lightly browned top.
Garnish with fresh basil if you have it. Serve hot, with pasta, garlic bread, or a simple green salad.