Name: Baked Spaghetti with Cream of Mushroom Soup Recipe
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: American
Ingredients: 1 cup chopped onion; 1 cup chopped green pepper; 1 pound ground beef, browned and drained (optional); 1 can (4 ounces) mushroom stems and pieces, drained; 1 can (2-1/4 ounces) sliced ripe olives, drained; 1 can (28 ounces) diced tomatoes, undrained; 2 teaspoons dried oregano; 12 ounces spaghetti, cooked and drained; 2 cups shredded cheddar cheese; 1/4 cup grated Parmesan cheese; 1 tablespoon butter; 1 can (10-3/4 ounces) condensed cream of mushroom soup, undiluted; 1/4 cup water

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I absolutely adore this Baked Spaghetti with Cream of Mushroom Soup Recipe because it brings together comfort and ease in one warm, cheesy dish. It feels like a big, welcoming hug on a plate, with layers of tender spaghetti, savory vegetables, and melty cheddar all smothered in creamy mushroom soup. Every time I make it, it’s like sharing a little slice of home with everyone around the table, and the aroma while it bakes is simply irresistible.

Why You’ll Love This Baked Spaghetti with Cream of Mushroom Soup Recipe

One of the things that makes this recipe so special to me is its unbeatable flavor combo. There’s something about the creamy mushroom soup mingling with the savory tomatoes, earthy mushrooms, and the slight bite from green peppers and olives that creates this rich, layered taste profile. The melted cheddar cheese adds that perfect gooeyness that turns simple spaghetti into something celebratory, yet comforting. I love how every bite feels full of flavor without being overwhelming.

Besides the taste, what really wins me over is how straightforward the preparation is. I can whip this up on a busy weeknight or save it for a cozy weekend meal without any fuss. It’s a one-dish wonder that fills the house with a welcoming scent and looks impressive laid out on the table even though it only takes about an hour from start to finish. It’s perfect for feeding a crowd during holidays, potlucks, or simply making enough to enjoy leftovers the next day.

Ingredients You’ll Need

The image shows ingredients arranged neatly on a white marbled surface, with a box of Barilla spaghetti centered at the top. Surrounding it are bowls and cans: a bowl of shredded cheddar cheese to the left, a bowl of cubed white cheese to the right of the spaghetti box, a bowl of chopped red bell peppers to the right, a bowl of shredded mozzarella cheese on the bottom right, and a bowl of diced onions on the bottom left. Below the cheddar bowl, there is a small glass measuring cup filled with a beige liquid, and next to it, a clear glass cup with a pale yellow liquid. Two cans, one of Ro*Tel diced tomatoes and green chilies and one of Campbell's cream of mushroom soup, sit in the center bottom. At the top right corner, a small white bowl holds mixed spices. Photo taken with an iphone --ar 4:5 --v 7

The beauty of this dish lies in its simple, straightforward ingredients that each play an important role in texture, flavor, and visual appeal. From fresh veggies to pantry staples, these items come together to build a hearty and satisfying casserole.

Chopped onion: Adds a sweet, aromatic base when sautéed, which deepens the overall flavor.
Chopped green pepper: Brings a mild crunch and fresh bite that contrasts nicely with the creamy elements.
Butter: Used to sauté the veggies, giving everything a rich, silky start.
Diced tomatoes (undrained): Adds juiciness and acidity to balance the richness.
Mushroom stems and pieces (drained): Enhance the mushroom flavor that’s central to the dish.
Sliced ripe olives (drained): Give a salty, briny punch that adds depth.
Dried oregano: Brings a warm, herbal note that complements all the other ingredients.
Ground beef (optional): Makes it heartier and perfect for meat lovers.
Spaghetti (cooked and drained): The pasta base that soaks up all the delicious flavors.
Shredded cheddar cheese: Creates that ooey-gooey cheesy layer everyone loves.
Condensed cream of mushroom soup (undiluted): The magic binder that adds creaminess and savory umami.
Water: Used to smooth out the soup before baking.
Grated Parmesan cheese: Sprinkled on top for a flavorful crust and finishing touch.

Directions

Step 1: In a large skillet, melt the butter over medium heat. Add the chopped onion and green pepper, sautéing until they become tender and fragrant, about 5 minutes. This step infuses the dish with fresh, sweet, and slightly crisp vegetable flavors.

Step 2: Stir in the undrained diced tomatoes, drained mushroom stems and pieces, drained sliced olives, and dried oregano. If you’re using ground beef, add the browned and drained meat now. Allow everything to simmer uncovered for about 10 minutes. This lets the flavors meld beautifully and the mixture reduce slightly.

Step 3: Preheat your oven to 350°F and lightly grease a 13×9-inch baking dish. Spread half of the cooked spaghetti evenly across the bottom of the dish to form the base layer.

Step 4: Spoon half of the vegetable (and beef if added) mixture over the spaghetti. Sprinkle 1 cup of shredded cheddar cheese evenly on top to create that rich cheesy layer you’ll love. Repeat these layers once more with the remaining spaghetti, vegetable mixture, and cheddar cheese.

Step 5: In a small bowl, whisk together the undiluted cream of mushroom soup and water until smooth. Pour this creamy mixture evenly over the assembled casserole. Then sprinkle the grated Parmesan cheese over the top to finish.

Step 6: Bake uncovered in the preheated oven for 30 to 35 minutes, or until the dish is heated through and the cheese is bubbly and golden in spots. You’ll know it’s ready when the edges just start bubbling up and the aroma fills your kitchen.

Servings and Timing

This recipe makes a generous 12 servings, perfect for a large family gathering or a party where you want to impress without stress. The prep time takes about 30 minutes, thanks to the quick sauté and assembling, while the cook time is around 30 to 35 minutes for a perfectly baked casserole. Altogether, you’re looking at just about an hour from start to mouthwatering finish with no resting or cooling needed unless you prefer to serve it warm.

How to Serve This Baked Spaghetti with Cream of Mushroom Soup Recipe

The image shows a white baking dish with creamy pasta topped with herbs and small pieces of meat, with a black spoon resting inside. In front of it is a white bowl filled with the same pasta, garnished with fresh green herbs. To the right, there is another white bowl with pasta and a small green bowl of grated cheese on a white marbled surface. A woman's hand is holding the black spoon. photo taken with an iphone --ar 4:5 --v 7

When I serve this baked spaghetti, I love pairing it with a simple green salad dressed in a light vinaigrette to add a fresh, crisp contrast. Roasted or steamed veggies like broccoli or green beans also complement the creamy, cheesy textures beautifully. For an extra special touch, I sometimes offer garlic bread or buttery dinner rolls on the side to mop up every last bit of sauce.

For garnishing, I sprinkle chopped fresh parsley or basil over the top right before serving to add a splash of vibrant color and a pop of herbal freshness. If you want to impress guests, serving individual portions in deep bowls and draping a sprig of thyme or oregano on top can make it feel extra special.

Beverage-wise, a chilled glass of medium-bodied red wine like Merlot or Zinfandel works wonders with the rich mushroom and tomato flavors, while non-alcoholic options like sparkling water with lemon or iced tea keep things refreshing. This dish shines during casual family dinners but also shows up beautifully at potlucks, holiday meals, or any time you want a guaranteed crowd-pleaser served warm straight from the oven.

Variations

One of my favorite things about this Baked Spaghetti with Cream of Mushroom Soup Recipe is how adaptable it is. If you want to keep it vegetarian, simply skip the ground beef and load up with extra mushrooms or add in other veggies like zucchini or spinach for more texture and nutrients. I’ve even swapped in Italian sausage for the beef when I’m craving something a little spicier.

For gluten-free eaters, I substitute regular spaghetti with gluten-free pasta. Just make sure to check that your canned soup is gluten-free or use a homemade mushroom sauce instead. If you’re vegan, you could try a dairy-free cheese alternative and swap the cream of mushroom soup for a homemade vegan mushroom sauce made with coconut milk or cashew cream, and it turns out deliciously creamy and satisfying.

If you want a bit of a flavor twist, adding a teaspoon of smoked paprika or substituting cheddar with a sharp provolone or mozzarella can give the casserole a different character. Don’t be afraid to experiment with baking it in individual ramekins for personalized servings that are perfect for special occasions or portion control.

Storage and Reheating

Storing Leftovers

After enjoying your meal, store any leftovers in airtight containers to keep everything fresh. I use glass or BPA-free plastic containers with tight-fitting lids. Leftovers will keep well in the fridge for up to 3 to 4 days. Before storing, I let the casserole cool to room temperature but never for more than two hours to keep food safety in check.

Freezing

This baked spaghetti freezes beautifully if you want to save some for later. I recommend dividing the casserole into individual or family-sized portions and freezing them in freezer-safe containers or heavy-duty freezer bags. It keeps well for up to 2 months. Be sure to label with the date so you know when to use it by, and thaw in the fridge overnight before reheating.

Reheating

To reheat leftovers, I usually recommend warming in the oven at 350°F until heated through, about 15-20 minutes for a whole dish or less for individual servings. This method helps preserve the casserole’s texture and prevents it from becoming too soggy. If you’re in a hurry, reheating in the microwave works too—just cover loosely and stir halfway through to ensure even heating. Avoid overheating to keep the cheese from separating and keep that creamy texture intact.

FAQs

Can I make this Baked Spaghetti with Cream of Mushroom Soup Recipe ahead of time?

Absolutely! You can prepare the casserole through Step 5 and refrigerate it for up to 24 hours before baking. Just add a few extra minutes to the bake time since it will be cold going into the oven.

Is it okay to use fresh mushrooms instead of canned?

Yes! Fresh mushrooms sautéed until tender make a great swap and add a lovely texture. Just cook them down first to release moisture before mixing with other ingredients to avoid watery casserole.

Can I use other types of pasta?

Definitely. While spaghetti works best for this recipe, penne, rotini, or other tubular pasta can hold the sauce nicely too. Just be sure to cook them al dente so they don’t get mushy after baking.

How can I make this recipe lower in calories?

Try using lean ground turkey instead of beef, reduce the cheese quantity, or use a low-fat or light cream of mushroom soup. Incorporating extra vegetables also boosts nutrition and volume without adding many calories.

What can I do if I don’t have cream of mushroom soup?

You can make a simple homemade version by combining sautéed mushrooms, a bit of flour, broth, and milk or cream to create a thick, creamy sauce. This will give you a fresher taste and let you control ingredients.

Conclusion

I truly hope you give this Baked Spaghetti with Cream of Mushroom Soup Recipe a try because it has been such a comforting favorite in my kitchen that I love sharing with friends and family. Its rich, creamy, and savory layers come together with such ease, and the leftovers always bring a smile the next day. Whether it’s for a big celebration or an easy weeknight meal, this recipe makes cozy dining effortless and rewarding. I can’t wait to hear how much you enjoy it as much as I do!