Combine chicken, garlic powder, salt, pepper, and Parmesan in a bowl and mix well. Roll mixture into 4 large meatballs and freeze for 10 minutes.
Preheat the oven to 425 degrees F (220 degrees C). Line a baking sheet with parchment and grease lightly.
Coat each ball in flour and press to form a thin oval patty about half inch in thickness and place on the prepared baking sheet.
Brush the top of each patty with egg and sprinkle each evenly with about 1 1/2 tablespoons breadcrumbs. Press the breadcrumbs lightly into the patty. Coat each patty with olive oil spray and flip. Repeat process on the second side and coat generously with cooking spray.
Bake in the preheated oven for 8 minutes. Flip the patties and coat once more with olive oil. Return to the oven and bake until browned and crisp, 6 to 8 minutes more. You may turn oven to Broil for 1 minute for extra browning.
Serve as is, or top each patty with mozzarella and return to the oven just until cheese is melted, about 1 minute.
Serve topped with marinara.
