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· 3.9 from 5 reviews

If you are craving a hearty, comforting, and downright delicious meal to feed your family or friends, this Spaghetti Casserole Recipe is about to become your new go-to. Picture tender spaghetti bathed in a rich tomato and herb sauce loaded with savory ground beef and mushrooms, then all topped off with a melty, golden blanket of mozzarella and parmesan cheese. It’s the kind of dish that combines simple, everyday ingredients into something spectacular, guaranteed to warm hearts and satisfy appetites with every bite.

Ingredients You’ll Need

The image shows various ingredients arranged neatly on a white marbled surface. In the center right, there is a white oval plate filled with brown mushrooms. Next to it, on the right, is a bundle of uncooked spaghetti tied with a white string. Toward the bottom right, there are two white bowls filled with grated cheese of different colors - one pale yellow and one white. Below the mushrooms and spaghetti, there is a white bowl filled with chopped onions. To its left is a small white dish with chopped green herbs. Near the bottom left, a larger white plate holds a square block of raw ground meat. Above this plate is a white bowl filled with shredded cheese. To its top left, there is a white bowl with bright red chopped tomatoes and another bowl with smooth red tomato sauce. Near the top left corner, there is a small bowl of chopped green herbs, and next to it a small bowl of peanuts. At the upper right, a small glass cup holds a clear liquid, probably oil. The overall layout is clean and organized, with a variety of colors and textures displayed clearly. Photo taken with an iphone --ar 4:5 --v 7

Gathering the right ingredients is key to achieving the perfect balance of flavors and textures in this casserole. Each item plays an important role—from the al dente spaghetti that forms the base to the fresh herbs that brighten the sauce, every addition brings something special to the table.

12 to 16 ounces spaghetti: The ideal foundation; make sure to cook it al dente so it doesn’t get mushy in the bake.
2 tablespoons olive oil: Adds a smooth, fruity richness when sautéing your aromatics and beef.
1 small yellow onion (diced): This sweet onion provides a subtle, savory depth to the sauce.
1 pound ground beef: The protein that brings hearty, meaty flavor to every bite.
3 cloves garlic (minced): Garlic’s fragrant punch elevates the taste remarkably.
1 teaspoon salt (or to taste): Enhances all the natural flavors and balances the dish perfectly.
¼ teaspoon freshly ground black pepper (or to taste): A little pepper kick complements the savory elements.
8 ounces sliced mushrooms: Earthy mushrooms add satisfying texture and umami richness.
28 ounces canned diced tomatoes (with juices): They create a vibrant, tangy tomato base for the sauce.
24 ounces jar of your favorite pasta/tomato sauce: Adds depth and convenience to your homemade sauce.
2 teaspoons dried oregano: Brings classic Italian herbal notes.
2 teaspoons dried basil: Adds sweet, peppery undertones for that comforting flavor.
2 teaspoons chopped fresh parsley: Freshness and a pop of green color to brighten the casserole.
1 cup shredded part-skim mozzarella cheese: Melts beautifully for that gooey cheese pull everyone loves.
1 cup shredded parmesan cheese: Adds a salty, nutty finish to the cheese topping.

How to Make Spaghetti Casserole Recipe

Step 1: Cook the Pasta

Start by cooking the spaghetti according to the package directions. It’s important to drain it well and set it aside because overcooked pasta can turn mushy during baking. This step lays down the foundation of your casserole with perfectly textured noodles ready to soak up all those delicious flavors.

Step 2: Sauté Aromatics and Ground Beef

Heat your olive oil in a large saucepan over medium heat. Toss in the diced onions and let them soften for about a minute—that little bit of sweetness they release is magic. Add the ground beef and minced garlic, seasoning with salt and pepper. Cook until the beef is nicely browned, stirring occasionally to break it down into tender crumbles that will evenly distribute in the casserole.

Step 3: Build the Flavorful Sauce

Time for the heart of the dish. Stir in your sliced mushrooms, canned diced tomatoes with juices, and the jarred pasta sauce. Bring everything to a boil, then reduce the heat and let it simmer covered for 15 minutes. This simmering melds the flavors beautifully. Once off the heat, mix in the oregano, basil, and fresh parsley—these herbs will infuse your sauce with that unforgettable Italian flair.

Step 4: Prep for Assembly

Preheat your oven to 375ºF and prepare a 9×13-inch casserole dish by lightly greasing it with cooking spray. This ensures your casserole layers won’t stick and you get perfect portions every time.

Step 5: Layer the Casserole

Start layering your ingredients in the baking dish with one-third of the meat sauce spread evenly on the bottom. Next, add half of the cooked spaghetti, distributing it evenly. Follow with half of the remaining meat sauce. Repeat the layers, finishing up with the last of the sauce on top. This layering ensures every forkful has a perfect ratio of pasta and savory sauce.

Step 6: Add the Cheesy Topping

Mix together the shredded mozzarella and parmesan cheeses in a small bowl. Sprinkle this cheesy blend generously over the entire casserole. This golden, bubbly topping is what turns this recipe from delicious to irresistible. Here’s a handy tip: at this stage, you can cool the casserole, cover it, and refrigerate it for a few days or freeze it for up to two months, making it convenient for busy days.

Step 7: Bake Until Bubbly

Bake the casserole uncovered for 18 to 20 minutes, or until the cheese has melted into a bubbly, golden crust. When you pull it out of the oven, let it rest for a few minutes—this is crucial so the casserole firms up a bit and slices beautifully.

How to Serve Spaghetti Casserole Recipe

The image shows a thick slice of baked spaghetti layered on a white plate. The bottom layer is cooked spaghetti, light yellow in color, twisted and piled high. On top of the pasta, there are mixed fillings including pieces of brown mushrooms, ground meat, and red tomato chunks. The top layer is melted cheese, creamy and stringy, covering the filling and garnished with small green parsley leaves. The plate is placed on a white marbled surface, with some scattered parsley and garlic cloves nearby. A silver fork rests on the right side of the plate. In the background, there is a white bowl filled with fresh brown mushrooms and a yellow and white patterned cloth. photo taken with an iphone --ar 4:5 --v 7

Garnishes

To elevate your Spaghetti Casserole Recipe, sprinkle some freshly chopped parsley or basil on top before serving. A light drizzle of extra virgin olive oil or a few red pepper flakes can bring a subtle kick and extra vibrancy to the plate. These garnishes add freshness and visual appeal that invite everyone to the table.

Side Dishes

This spaghetti casserole pairs wonderfully with simple sides like a crisp green salad tossed in a tangy vinaigrette or buttery garlic bread to scoop up every bit of sauce. Roasted vegetables such as asparagus or broccoli also complement the richness and provide a delightful contrast to the creamy, cheesy layers.

Creative Ways to Present

Looking to impress? Serve this casserole in individual ramekins for beautifully portioned personal servings. For casual gatherings, dish it straight from the pan surrounded by bowls of various toppings—like sliced olives, chopped scallions, or grated cheese—so everyone can customize their plate. It’s a cozy, interactive way to enjoy this comforting classic.

Make Ahead and Storage

Storing Leftovers

Leftover spaghetti casserole is a gift that keeps on giving. Store it in an airtight container in the refrigerator for up to 3 to 4 days. Make sure to cool the dish to room temperature before refrigerating to keep the texture and flavors intact.

Freezing

This Spaghetti Casserole Recipe freezes beautifully. Wrap it tightly in plastic wrap and aluminum foil or place in a freezer-safe container. It can be frozen for up to 2 months, allowing you to enjoy homemade comfort on those days when you need a quick, reliable meal.

Reheating

To reheat, thaw the casserole in the refrigerator overnight if frozen. Reheat in the oven at 350ºF, covered with foil, for about 20 minutes or until warmed through. You can remove the foil at the end to refresh the cheesy topping. Alternatively, single portions reheat well in the microwave, though the oven method preserves texture best.

FAQs

Can I use a different type of pasta for this Spaghetti Casserole Recipe?

Absolutely! While spaghetti is traditional, feel free to substitute with penne, fusilli, or any pasta shape you prefer. Just adjust cooking time accordingly to maintain the perfect texture.

Is it possible to make this casserole vegetarian?

Yes! Simply replace the ground beef with a plant-based meat substitute or a mix of hearty vegetables like lentils, zucchini, and eggplant to maintain the richness of the dish.

Can I prepare this Spaghetti Casserole Recipe ahead of time?

Definitely. You can assemble the casserole, cover it tightly, and refrigerate it for up to 2 days before baking. This makes it ideal for meal prep or busy weeknights.

What type of cheese works best for this recipe?

Part-skim mozzarella and parmesan are classic choices because they melt well and offer excellent flavor without becoming too greasy. You can experiment with provolone or fontina for a different twist.

How spicy is this casserole?

This recipe is mild and family-friendly. If you like heat, you can add red pepper flakes or a splash of hot sauce to the sauce before baking for a gentle kick.

Final Thoughts

There is something so comforting and satisfying about a home-cooked casserole, and this Spaghetti Casserole Recipe hits all the right notes. Whether you’re feeding a crowd or simply craving a filling, flavorful meal, this dish delivers both nostalgia and taste in every cheesy, saucy bite. Give it a try and watch it become a beloved classic in your kitchen too!