This Slow Cooker Meatball Casserole is a hearty, comforting, and easy-to-make dish that’s perfect for busy weeknights or laid-back weekends. With juicy meatballs, tender pasta, and a rich marinara sauce all simmered together in a slow cooker, this recipe offers a no-fuss solution to a delicious home-cooked meal.

Why You’ll Love This Recipe

This casserole is not only flavorful and filling, but it’s also a set-it-and-forget-it kind of recipe. The slow cooker does most of the work, making it ideal for busy families or anyone who wants a low-effort dinner. You get the savory satisfaction of meatballs, pasta, and cheese in every bite—without having to babysit the stove. It’s also customizable, budget-friendly, and perfect for meal prep.

ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

Frozen meatballs (or homemade, fully cooked)
Marinara sauce
Uncooked pasta (like rotini or penne)
Shredded mozzarella cheese
Grated parmesan cheese
Italian seasoning
Garlic powder
Water or low-sodium chicken broth
Fresh basil (optional, for garnish)

directions

Lightly grease the inside of the slow cooker.
Pour a small amount of marinara sauce on the bottom.
Add the frozen (or pre-cooked) meatballs on top of the sauce.
Sprinkle in the seasonings and garlic powder.
Pour in the uncooked pasta, then the remaining marinara sauce and water or broth. Stir lightly to combine, ensuring pasta is mostly submerged.
Cover and cook on high for 2.5 to 3 hours, or until pasta is tender.
In the final 15 minutes of cooking, sprinkle mozzarella and parmesan cheese over the top. Cover again and cook until cheese is melted.
Serve hot, garnished with fresh basil if desired.

Servings and timing

This recipe yields approximately 6 servings.
Prep Time: 10 minutes
Cook Time: 3 hours on high or 5-6 hours on low
Total Time: About 3 hours 10 minutes

Variations

Spicy version: Add red pepper flakes or use spicy marinara.
Vegetarian: Use plant-based meatballs and vegetarian broth.
Cheese swap: Try provolone or cheddar for a twist.
Add veggies: Stir in mushrooms, spinach, or bell peppers for extra nutrition.
Low-carb option: Use zucchini noodles or cauliflower pasta.

storage/reheating

Store leftovers in an airtight container in the refrigerator for up to 4 days.
To reheat, microwave individual portions for 1-2 minutes or warm on the stovetop over medium heat until heated through.
You can also freeze the casserole in a freezer-safe container for up to 2 months. Thaw overnight in the fridge before reheating.

FAQs

Can I use homemade meatballs instead of frozen?

Yes, just make sure they are fully cooked before adding them to the slow cooker.

Will the pasta get mushy in the slow cooker?

Not if you follow the timing—add it uncooked and don’t overcook. It turns out perfectly tender.

Can I cook it on low instead of high?

Yes, cook on low for about 5–6 hours.

Can I use a different type of pasta?

Absolutely! Short pastas like penne, rotini, or rigatoni work best.

Is it necessary to brown the meatballs first?

Not if you’re using frozen or pre-cooked meatballs. Browning can add flavor, but it’s optional.

How do I prevent the pasta from clumping together?

Stir gently after adding the sauce and liquid to help separate the pasta.

Can I make this casserole dairy-free?

Yes, simply omit the cheese or use dairy-free cheese alternatives.

Is it possible to double the recipe?

Yes, just make sure your slow cooker is large enough and adjust cook time slightly if needed.

What can I serve with this casserole?

A simple green salad or garlic bread pairs well with it.

Can I prepare this ahead of time?

You can assemble the ingredients in the slow cooker insert and refrigerate overnight. Just start cooking when you’re ready.

Conclusion

Slow Cooker Meatball Casserole is the ultimate comfort food made easy. With just a few ingredients and minimal prep, you get a delicious, family-friendly meal that’s sure to become a regular in your dinner rotation. Whether you’re feeding a crowd or looking for simple weeknight fare, this recipe delivers flavor and convenience in every bite.