Preheat your oven to 400°F (200°C).
Combine the breadcrumbs, grated Parmesan cheese, garlic powder, Italian seasoning, salt, and pepper in a mixing bowl.
Dip each chicken breast into the breadcrumb mixture, ensuring an even coating.
Arrange the coated chicken breasts flat in a glass baking dish.
Drizzle a little olive oil over the chicken to enhance flavor and crispness.
Bake in the preheated oven for 20 minutes, until the chicken is cooked through and the crust is crispy.
Remove the dish from the oven and spoon marinara sauce evenly over each chicken breast.
Top generously with shredded mozzarella cheese.
Return to the oven and bake for an additional 10-15 minutes, or until the cheese is bubbling and golden.
Serve hot and enjoy!