This hearty Baked Spaghetti and Meatballs Casserole brings together flavorful homemade meatballs, perfectly cooked spaghetti, and a savory marinara sauce, all topped with a bubbly blend of mozzarella and Parmesan.

Baked Spaghetti and Meatballs Casserole

Meatball Ingredients

INGREDIENT	QUANTITY
Ground beef	1 pound
Breadcrumbs	1/2 cup
Grated Parmesan	1/4 cup
Milk	1/4 cup
Finely chopped onion	1/4 cup
Egg	1
Salt	1 teaspoon
Black pepper	1/2 teaspoon
Garlic powder	1/2 teaspoon
Dried oregano	1/2 teaspoon
Dried basil	1/2 teaspoon

Casserole Ingredients

INGREDIENT	QUANTITY
Spaghetti	12 ounces
Marinara sauce	1 jar (24 ounces)
Shredded mozzarella	1 1/2 cups
Grated Parmesan	1/4 cup
Fresh basil	Optional

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How to Make Baked Spaghetti and Meatballs Casserole

Step 1 — Heat Oven & Prepare Meatballs

Set your oven to 375°F (190°C) and lightly coat a 9×13-inch baking dish with cooking spray. In a large mixing bowl, combine the ground beef, breadcrumbs, Parmesan, milk, onion, egg, and seasonings. Blend well and roll into meatballs about 1–1½ inches in size.

Step 2 — Cook Pasta & Brown Meatballs

Prepare the spaghetti according to the package until just al dente, then drain. Warm a bit of olive oil in a skillet over medium heat and sear the meatballs until they’re browned on all sides.

Step 3 — Create the Base Layer

Spread half of the marinara sauce across the bottom of the prepared dish. Lay the cooked spaghetti over the top.

Step 4 — Add the Sauce & Arrange Meatballs

Pour the remaining marinara over the spaghetti and gently toss to coat. Position the browned meatballs evenly across the casserole.

Step 5 — Add Cheese & First Bake

Scatter the mozzarella and Parmesan over the top. Cover with foil and bake for about 25 minutes.

Step 6 — Finish Baking

Remove the foil and continue baking for 10–15 more minutes, or until the cheese is melted and bubbly and the meatballs register 160°F (71°C). Garnish with fresh basil if desired.