Cheesy meatball sub casserole deconstructs the classic sandwich into a bubbly bake with meatballs, marinara, and melted cheese. This protein-rich family dinner is fun, easy, and disappears fast.
Preheat oven to 375°F and drizzle olive oil onto the bottom of a 9x13-inch baking dish.
Slice French bread into thick pieces and line the bottom of the prepared dish; brush lightly with olive oil and sprinkle with garlic powder.
Spread ricotta cheese evenly over bread slices, then layer marinara sauce across the entire surface.
Arrange Italian-style meatballs over the sauce in a single layer and sprinkle with Italian seasoning, salt, and pepper.
Cover with shredded mozzarella cheese and bake uncovered for 30-35 minutes until the cheese is bubbly and golden, then rest for 5 minutes before serving.