Name: Spaghetti Casserole Recipe
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: Italian-American
Ingredients: 12 to 16 ounces spaghetti; 2 tablespoons olive oil; 1 small yellow onion, diced; 1 pound ground beef; 3 cloves garlic, minced; 1 teaspoon salt (or to taste); ¼ teaspoon freshly ground black pepper (or to taste); 8 ounces sliced mushrooms; 28 ounces canned diced tomatoes (with juices); 24 ounces jar of your favorite pasta/tomato sauce; 2 teaspoons dried oregano; 2 teaspoons dried basil; 2 teaspoons chopped fresh parsley; 1 cup shredded part-skim mozzarella cheese; 1 cup shredded parmesan cheese

Jump to Recipe· 3.8 from 11 reviews

I absolutely love sharing this Spaghetti Casserole Recipe with friends and family because it perfectly combines all the flavors I crave in a comforting pasta dish. This casserole is a warm, cheesy hug in a dish — layered with tender spaghetti, savory beef sauce, mushrooms, and a delightfully melty blanket of mozzarella and parmesan cheese. It’s a dish I turn to when I want something hearty yet straightforward, and every time, it brings everyone back for seconds.

Why You’ll Love This Spaghetti Casserole Recipe

What truly makes this Spaghetti Casserole Recipe stand out for me is the way the flavors meld together in each bite. The savory ground beef simmers with garlic, mushrooms, and herbs, creating a rich sauce that clings to every strand of spaghetti. The combination of both diced tomatoes and a flavorful pasta sauce adds depth and freshness, while the melted mozzarella and parmesan on top create that irresistible golden crust I crave. It’s comfort food elevated with layers of texture and flavor that feel homey and special all at once.

I also really appreciate how easy this casserole is to prepare. It’s a one-dish wonder that doesn’t demand fancy techniques or hard-to-find ingredients. The steps are straightforward, and time spent building the layers turns into a fun and satisfying process. Plus, it’s perfect for a family dinner, casual get-together, or even meal prep since it reheats wonderfully. I especially love making this recipe on a weekend when I want a cozy meal that fills the house with inviting aromas without any fuss.

Ingredients You’ll Need

A beige pan with a wooden handle sits on a white marbled surface, filled with a cooked dish made of ground meat, sliced mushrooms, diced tomatoes, and small pieces of onion, all mixed together in a thick, reddish sauce. A wooden spoon rests inside the pan, partially dipped into the mixture. The colors range from brown and beige for the meat and mushrooms, to bright red and orange for the tomatoes, and translucent white for the onions. The texture looks tender with some moisture glistening on the ingredients. photo taken with an iphone --ar 4:5 --v 7

These ingredients are simple, yet each one plays an essential role in building the delicious taste, perfect texture, and appealing color that make this casserole shine.

Spaghetti (12 to 16 ounces): The base of the casserole, providing a tender but sturdy pasta that holds up well in baking.
Olive oil (2 tablespoons): Used to sauté the onions and beef, adding richness and helping develop flavor.
Small yellow onion, diced: Adds sweetness and aroma, balancing the savory components.
Ground beef (1 pound): The hearty protein that makes this casserole filling and flavorful.
Garlic cloves (3, minced): For that essential savory kick and depth of flavor.
Salt and freshly ground black pepper: To season and enhance the flavors naturally.
Sliced mushrooms (8 ounces): Adds earthiness and a wonderful meaty texture that complements the beef.
Canned diced tomatoes with juices (28 ounces): Lends brightness and a fresh tomato taste.
Your favorite pasta/tomato sauce (24 ounces): Brings that familiar, comforting flavor we expect in Italian dishes.
Dried oregano and dried basil (2 teaspoons each): Classic Italian herbs that give the sauce an authentic, aromatic lift.
Fresh parsley, chopped (2 teaspoons): Adds a burst of freshness right before baking.
Shredded part-skim mozzarella cheese (1 cup): Melts beautifully, creating that gooey, irresistible top layer.
Shredded parmesan cheese (1 cup): Adds a sharp, nutty flavor with a light crust on top.

Directions

Step 1: Cook the spaghetti following the package instructions until it’s al dente. Drain the noodles thoroughly and set them aside so they’re ready to layer in the casserole.

Step 2: Heat the olive oil in a large saucepan over medium heat. Add the diced onions and cook for about 1 minute until they start to soften and smell sweet. Then, toss in the ground beef and minced garlic. Season everything with salt and freshly ground black pepper. Stir frequently and cook until the beef is browned and no longer pink.

Step 3: Add the sliced mushrooms to the pan and stir them into the beef mixture. Pour in the canned diced tomatoes with their juices as well as the jar of your favorite pasta sauce. Bring this mixture up to a gentle boil, then reduce the heat to low and cover. Let it simmer for about 15 minutes so the flavors marry and the mushrooms soften.

Step 4: Remove the sauce from the heat and stir in the dried oregano, dried basil, and fresh chopped parsley. These herbs create a fragrant, flavorful sauce that perfectly seasons the beef and veggies.

Step 5: Preheat your oven to 375ºF. Lightly grease a 9×13-inch casserole dish with cooking spray or a bit of oil to prevent sticking.

Step 6: Begin layering the casserole by spreading one third of the beef sauce on the bottom of the dish. Next, add half of the cooked spaghetti over the sauce. Follow with half of the remaining beef sauce on top of the noodles. Repeat this layering process until you end with a final top layer of beef sauce.

Step 7: In a small bowl, mix the shredded mozzarella and parmesan cheese together. Evenly sprinkle this cheesy mixture over the top of the casserole for that luscious golden crust.

Step 8: Bake the casserole uncovered for 18 to 20 minutes, or until you see bubbling sauce and perfectly melted cheese. Let the casserole rest for a few minutes once it’s out of the oven to let everything set before serving.

Servings and Timing

This Spaghetti Casserole Recipe yields about 6 hearty servings, making it perfect for a family meal or sharing with friends. Prep time is about 20 minutes, mostly for chopping, cooking the pasta, and browning the meat. The simmering and baking steps add approximately 40 minutes combined, so the total time from start to finish is close to 1 hour. A short resting time after baking helps everything settle so portions cut cleanly and flavors deepen.

How to Serve This Spaghetti Casserole Recipe

A white plate holds a large mound of yellow spaghetti pasta mixed with ground meat, dark brown mushrooms, and chunks of red tomato, all coated with melted creamy cheese that stretches over the top. Small green herbs are sprinkled over the dish, adding color and freshness. The plate is set on a white marbled surface with a silver fork placed on the right side. In the background, there is a white bowl filled with whole brown mushrooms and a soft yellow-and-white cloth. Photo taken with an iphone --ar 4:5 --v 7

When I serve this Spaghetti Casserole Recipe, I often pair it with a crisp green salad dressed lightly with lemon vinaigrette to add brightness against the rich, cheesy pasta. Roasted or steamed vegetables, like broccoli or green beans, make a nice, simple side to round out the meal with some refreshing crunch. If I’m feeling indulgent, warm garlic bread is always a winner alongside this cheesy classic.

I love to garnish the casserole just before serving with a sprinkle of fresh parsley or basil leaves to add a pop of color and fresh aroma. For plating, I like generous portions, about a hearty scoop per plate, and usually serve it warm so the melted cheese is gooey and the flavors at their peak.

For drinks, a medium-bodied red wine such as Chianti or Sangiovese pairs beautifully with the tomato-based sauce. If wine isn’t your thing, a sparkling water with a twist of lemon or a light iced tea balances the richness perfectly. This casserole is so versatile, it shines at casual weeknight dinners, cozy weekend family meals, and even holiday gatherings where comfort food is the star.

Variations

If you want to customize this Spaghetti Casserole Recipe, I’ve found a few fun variations that work wonderfully. Swap the ground beef for ground turkey or Italian sausage for different flavors and textures — sausage adds a spicy, savory punch while turkey lightens it up. To keep it vegetarian, skip the meat and load the dish with extra mushrooms, zucchini, or bell peppers; adding lentils can also boost the protein content nicely.

For dietary preferences, you can easily make a gluten-free version by using gluten-free spaghetti. For a vegan spin, substitute the beef with plant-based protein crumbles and swap the cheeses for vegan mozzarella and parmesan alternatives — just make sure your pasta sauce is free of animal products too. Another flavor twist I love is adding red pepper flakes or smoked paprika for a subtle kick or smoky depth where you want more excitement.

Lastly, if you’re short on time, you can prepare the beef sauce ahead and refrigerate it. When assembling, try layering everything in individual ramekins for fun, personalized servings that bake faster and look adorable on the table. No matter how you change it up, this recipe adapts easily without losing the comforting essence that makes Spaghetti Casserole so special.

Storage and Reheating

Storing Leftovers

I always store leftover spaghetti casserole in airtight containers or tightly covered with plastic wrap to keep it fresh. Refrigerate it for up to 3 to 4 days. When I portion it out after dinner, storing individual servings means I can grab and reheat just what I need without hassle.

Freezing

This casserole freezes beautifully, which makes it perfect for meal prepping. To freeze, I cover the casserole dish tightly with foil or transfer portions into freezer-safe containers, then store it for up to 2 months. To avoid freezer burn, I sometimes layer parchment paper between servings. When you want to enjoy it, thaw it overnight in the refrigerator before reheating.

Reheating

To reheat, I prefer warming individual portions in the oven at 350ºF for about 15-20 minutes, which helps retain the crispy edges and melty cheese texture. Microwaving works in a pinch but can make the noodles a bit softer, so I recommend covering loosely and heating in short bursts to avoid drying out. Adding a splash of water or extra sauce before reheating helps rejuvenate the casserole’s moisture and flavor.

FAQs

Can I use other types of pasta instead of spaghetti?

Absolutely! While spaghetti works beautifully here, you can substitute with penne, rigatoni, or even rotini. The key is to use a pasta shape that holds sauce well and bakes nicely for great texture.

Is it possible to make this casserole ahead of time?

Yes, this recipe is perfect for preparing in advance. You can assemble it, cover, and refrigerate for up to 2 days before baking. This makes it an ideal dish for busy weeknights or entertaining without stress.

How do I know when the casserole is fully cooked?

Look for bubbling sauce edges and melted, lightly golden cheese on top. The dish will be hot throughout and the cheese fully melted after baking for about 18-20 minutes at 375ºF.

Can I use fresh herbs instead of dried?

You can, but keep in mind fresh herbs are more delicate and less concentrated. I add fresh parsley at the end for brightness, but for oregano and basil, I prefer dried during cooking because their flavors hold up well to simmering.

What should I do if my casserole is too dry after baking?

If it feels dry, you can drizzle a little extra pasta sauce or a splash of olive oil before baking next time. Also, covering the dish loosely with foil for part of the baking can help keep moisture locked in.

Conclusion

I hope you’ve enjoyed learning about this Spaghetti Casserole Recipe as much as I enjoy making it. It’s one of those dishes that feels like a warm hug after a long day, yet it’s simple enough to whip up any time you want comforting, cheesy pasta magic. Trust me, once you try it, this casserole will quickly become one of your favorite go-to meals to nourish both body and soul. Happy cooking!