Preheat your oven to 375°F (190°C).
Flatten the chicken breasts to an even thickness using a meat mallet.
In a bowl, mix breadcrumbs, Parmesan cheese, garlic powder, and Italian seasoning.
Dip each chicken breast in the beaten egg, then coat with the breadcrumb mixture.
Heat olive oil in a skillet over medium heat.
Fry the chicken for about 4-5 minutes on each side until golden brown.
Remove the chicken from the skillet and place it in a baking dish.
Pour marinara sauce over each chicken breast.
Sprinkle shredded mozzarella cheese generously on top.
Bake in the oven for 20 minutes or until the cheese is bubbly and golden.