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!