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Meatball Submarine Casserole

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Meatball Submarine Casserole is a comforting, oven-baked twist on the classic meatball sub sandwich. It layers juicy meatballs, marinara sauce, gooey cheese, and toasted bread for a crowd-pleasing weeknight dinner or game-day meal.

Ingredients

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  • 1 lb frozen or homemade cooked meatballs
  • 1 (24 oz) jar marinara sauce
  • 1/2 cup water
  • 1 French baguette or 4 hoagie rolls, sliced
  • 2 cups shredded mozzarella cheese
  • 1/2 cup grated Parmesan cheese
  • 1 teaspoon Italian seasoning
  • 2 tablespoons butter, melted
  • 2 cloves garlic, minced
  • Fresh parsley, chopped (optional, for garnish)

Instructions

  1. Preheat oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish.
  2. In a bowl, mix melted butter and garlic. Toss sliced bread in the mixture and layer the bottom of the baking dish with it.
  3. In a large skillet, heat marinara sauce with water. Add meatballs and simmer for 10 minutes if frozen, or 5 minutes if fresh, until heated through.
  4. Spoon the meatballs and sauce evenly over the bread layer in the dish.
  5. Sprinkle mozzarella and Parmesan cheeses over the top, followed by Italian seasoning.
  6. Bake uncovered for 20–25 minutes until the cheese is melted and bubbly.
  7. Let cool slightly, then garnish with fresh parsley and serve warm.

Notes

  • Use garlic bread for extra flavor and texture in the base.
  • Make ahead and refrigerate before baking—just add 5–10 minutes to the cook time.
  • Customize with bell peppers, onions, or red pepper flakes for extra flavor.

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