Baked Spaghetti Recipe With Alfredo Sauce: Cheesy Layers of Oven-Baked Bliss

This oven-baked spaghetti with alfredo sauce delivers restaurant-quality comfort in every bite. Layers of pasta, creamy sauce, and melted cheese create a dish that’s hard to resist.

I’ve perfected the baking time and temperature to ensure golden edges and a bubbling, cheesy top. It’s a satisfying meal that’s easier to make than you’d think.

Ingredients for Baked Spaghetti Recipe with Alfredo Sauce

Pantry staples plus a few fresh items create this decadent baked pasta dish.

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The Parmesan is non-negotiable for that restaurant-quality flavor. Grab a wedge from Whole Foods or Costco—pre-grated doesn’t melt the same. I always use Barilla spaghetti for this; it holds up to baking better than most. The heavy cream and butter should be full-fat (don’t even think about substitutions here). Nutmeg might seem odd, but that tiny amount makes the sauce sing.

No heavy cream? Half-and-half plus a tbsp of butter per cup gets you close. Out of Parmesan? Pecorino Romano works in a pinch (stronger flavor, so use less). Fresh garlic is ideal, but jarred minced garlic at half the amount saves time. The mozzarella can be part-skim if you’re watching calories, but full-fat melts better. Skip the pre-shredded—it’s coated with anti-caking agents.

Assemble and bake right away, or refrigerate the casserole for up to 24 hours before baking. Leftovers keep 3-4 days in the fridge and freeze for 2 months. Reheats like a dream—cover with foil to prevent drying.

Step-by-Step Instructions for Baked Spaghetti With Alfredo Sauce

This method ensures creamy, cheesy layers with a golden-brown top every time.

Step 1: Cook and Drain the Spaghetti Noodles

Bring a large pot of salted water to a rolling boil. Add the 12 oz Spaghetti Noodles and cook according to package directions until just al dente—about 1 minute less than the recommended time. You want them slightly undercooked since they’ll finish in the oven.

Drain the noodles in a colander but don’t rinse them. The surface starch helps the sauce cling better. Toss the hot noodles with a drizzle of the unsalted butter to prevent sticking while you prepare the sauce.

Step 2: Make the Creamy Alfredo Sauce

In a large saucepan, melt the remaining 0.5 cup Unsalted Butter over medium heat. Add the 0.25 cup All-Purpose Flour and whisk constantly for 1-2 minutes until the mixture turns light golden brown and smells slightly nutty—this is your roux.

Gradually whisk in the 2 cups Heavy Cream and 1 cup Whole Milk, ensuring no lumps form. Stir in the minced 4 cloves Garlic Cloves, 1 tsp Salt, 0.5 tsp Ground Black Pepper, and 0.25 tsp Ground Nutmeg. Cook for 3-4 minutes until the sauce thickens enough to coat the back of a spoon.

Remove from heat and stir in the 1.5 cups Parmesan Cheese until fully melted and smooth. The sauce should be rich and velvety, not grainy.

Step 3: Combine Pasta and Sauce

In a large bowl, pour the alfredo sauce over the cooked Spaghetti Noodles. Use tongs or a large spoon to toss everything together until the noodles are evenly coated. The sauce should cling to each strand without pooling at the bottom.

If the mixture seems too thick, add a splash of the reserved pasta water to loosen it. This ensures the noodles stay creamy and don’t dry out during baking.

Step 4: Layer and Bake to Golden Perfection

Transfer half of the sauced noodles to a greased 9×13-inch baking dish. Sprinkle 1 cup Mozzarella Cheese evenly over the top. Add the remaining noodles, then top with the remaining 1 cup Mozzarella Cheese. The cheese should form a complete layer with no gaps.

Bake in a preheated 375°F oven for 20-25 minutes until the top is bubbly and golden brown and the edges are slightly crisp. For extra browning, broil for 1-2 minutes at the end, but watch closely to prevent burning.

Step 5: Rest and Garnish Before Serving

Remove the dish from the oven and let it rest for 5-10 minutes. This allows the layers to set slightly, making it easier to serve clean portions. The cheese will thicken as it cools, creating that perfect pull when scooped.

Sprinkle the 0.25 cup Fresh Parsley over the top just before serving. The fresh parsley adds a pop of color and a light, fresh contrast to the rich, cheesy dish. Serve immediately while hot and bubbly.

Troubleshooting baked spaghetti recipe with alfredo sauce

🥘 Too Dry or Tough?

Overbaking or insufficient sauce can leave your spaghetti dry. Pasta absorbs moisture in the oven, so timing is key.

Quick Fix: Cover with foil for the first 20 minutes to retain moisture. Add a splash of milk or extra Alfredo sauce before serving.

🧀 Sauce Separating?

Alfredo sauce can split if overheated or not emulsified properly. High heat causes the cheese to clump instead of melting smoothly.

Quick Fix: Warm the sauce on low heat, stirring constantly. Add a tablespoon of cream or butter to rebind the ingredients.

🔥 Uneven Cooking?

If the top burns while the center stays cold, your oven may have hot spots or the dish is too thick.

Quick Fix: Rotate the dish halfway through baking. For even cooking, ensure layers are spread uniformly and the oven is preheated.

🧂 Bland Flavor?

Underseasoned pasta or sauce can make the dish taste flat. Salt enhances flavors, especially in rich dishes like Alfredo.

Quick Fix: Taste and adjust seasoning before baking. Add garlic powder, Italian seasoning, or a pinch of salt to elevate the flavor.