- Preheat the oven to 400°F (204°C) and line a baking sheet with foil. Brush it with olive oil. 
- Halve the chicken breasts and pound them to an even thickness. 
- Pat the chicken dry with a paper towel, then season with salt and pepper. 
- In a shallow dish, mix panko bread crumbs, grated parmesan cheese, salt, pepper, garlic powder, oregano, and black pepper. 
- Whisk an egg in another shallow dish. 
- Dip each chicken breast into the egg, then the bread crumb mixture. Ensure it’s fully coated and place it on the prepared baking sheet. 
- Bake on the second from the top rack for 15 minutes, or until cooked through. 
- Flip the chicken, pour 1/4 cup of marinara sauce over each piece, then top with shredded mozzarella cheese. Put it back in the oven. 
- Turn on the broiler and broil for 2-4 minutes, until the cheese is melted and bubbly, and the chicken edges are browning. 
- Garnish with minced parsley if desired and serve hot. Buon appetito!