Alfredo Baked Spaghetti Casserole Recipe

Why You’ll Love This Alfredo Baked Spaghetti

Alfredo Baked Spaghetti is the kind of cozy pasta dinner that feels like a warm hug after a long day. It takes simple pantry staples, turns them into a creamy baked casserole, and gives you that bubbly, cheesy finish everyone leans in for. If you need a dinner that works for busy weeknights, family gatherings, or meal prep, this one checks a lot of boxes.

• Easy enough for busy nights: You only need about 15 minutes of prep time, then the oven does most of the work. That makes this a smart pick for working professionals, parents, and students who want a filling dinner without a lot of fuss.
• Rich comfort food flavor: The sauce combines butter, milk, cream, mozzarella, and Parmesan for a velvety texture that clings to every strand of spaghetti. It tastes like classic Alfredo, but the baked finish adds a little extra magic.
• Good for make-ahead planning: You can assemble it ahead of time, refrigerate it, or freeze it for later. That is a huge help for party hosts, newlyweds, and anyone who likes to get dinner out of the way early.
• Flexible for different eaters: This pasta bake fits vegetarian meals and works with several simple swaps if you need gluten-free, lighter, or protein-rich changes. It is a nice option when you are feeding a mixed crowd.

When a recipe gives you creamy sauce, golden cheese, and a simple prep path, it has a good chance of becoming a repeat dinner.

If you like cozy desserts for after dinner, you might also enjoy browsing this rich black forest trifle recipe or checking out chewy molasses cookies for a sweet finish.

Essential Ingredients for Alfredo Baked Spaghetti

Below is the full ingredient list for a 6-serving casserole. Every item matters because the sauce, pasta, and cheese all work together to create the final creamy texture.

• 1 pound dried spaghetti noodles – The base of the casserole. Cooking them just shy of al dente keeps them from turning mushy in the oven.
• 3 tablespoons unsalted butter – Builds the rich base for the sauce and helps the flour cook smoothly.
• 3 tablespoons all-purpose flour – Thickens the Alfredo sauce into a creamy, spoonable texture.
• 3 cups whole or 2 percent milk – Forms the main liquid in the sauce and keeps the casserole silky.
• 1 cup heavy cream – Adds body and that classic Alfredo richness.
• 6 ounces low-moisture mozzarella cheese, shredded and divided – Gives the bake its stretchy, melty top and creamy interior.
• 4 ounces finely grated Parmesan cheese, divided – Adds salty, nutty flavor throughout the sauce and on top.
• 1/2 teaspoon garlic powder – Brings gentle savory flavor without overpowering the dish.
• 1 teaspoon kosher salt, plus more for the pasta water – Seasons the sauce and the pasta itself.
• Finely chopped parsley leaves, for serving, optional – Adds a fresh, bright finish right before serving.

Special Dietary Options

• Vegan: Use plant-based butter, unsweetened oat milk or soy-free vegan milk, vegan cream, and dairy-free mozzarella and Parmesan-style cheese.
• Gluten-free: Swap in gluten-free spaghetti and use a gluten-free all-purpose flour blend for the sauce.
• Low-calorie: Use 2 percent milk, reduce the cream slightly, and choose part-skim mozzarella to lighten the dish a bit.

How to Prepare the Perfect Alfredo Baked Spaghetti: Step-by-Step Guide

This dish comes together in about 55 minutes total, including 15 minutes of prep and 40 minutes of cooking. The process is simple, but a few small details make a big difference in the final texture.

First Step: Get the oven and pasta water ready

Arrange the oven racks so one sits in the middle and one near the top. Heat the oven to 375°F. While the oven warms, bring a large pot of heavily salted water to a boil. Salting the water well is important because it seasons the spaghetti from the inside out.

Add 1 pound dried spaghetti noodles and cook them for 1 minute less than al dente according to the package directions. This keeps the pasta firm enough to finish cooking in the oven without turning soft. When the pasta is ready, drain it and set it aside briefly.

Second Step: Start the Alfredo sauce

Set a large pot over medium heat and melt 3 tablespoons unsalted butter. Once the butter is melted and foamy, whisk in 3 tablespoons all-purpose flour. Cook this mixture for a short time until it turns lightly golden. That step takes away the raw flour taste and gives the sauce a smoother flavor.

Keep whisking so the mixture does not clump or scorch. You are building the base that will thicken the milk and cream later on.

Third Step: Add the milk and cream slowly

Slowly whisk in 3 cups milk and 1 cup heavy cream. Add the liquid in a steady stream and keep whisking while you go. This helps the sauce stay smooth instead of lumpy.

Bring the mixture to a boil, then reduce the heat and let it simmer until it thickens. You want a sauce that coats a spoon, not one that runs thin. If you are new to white sauces, this is the moment to stay close and keep stirring.

Fourth Step: Stir in the cheese and seasonings

Take the pot off the heat. Whisk in 4 ounces of the shredded mozzarella, 3 ounces of the grated Parmesan, 1/2 teaspoon garlic powder, and 1 teaspoon kosher salt. The sauce should turn glossy and smooth as the cheese melts.

Taste the sauce if you like, then adjust with a little more salt only if needed. Since Parmesan is naturally salty, a small amount of seasoning often goes a long way. Freshly grated cheese makes the sauce taste better and melt more evenly than shelf-stable pre-shredded versions.

Fifth Step: Combine the pasta and sauce

Add the drained spaghetti to the sauce and toss until every strand is coated. Use tongs if you have them, because they make it easier to mix the noodles evenly. You want the sauce to nestle into the pasta, not pool at the bottom of the pan.

If the sauce seems very thick, you can add a small splash of milk to loosen it a little before baking. The pasta should look generously coated and ready for the oven.

Sixth Step: Assemble the casserole

Transfer the sauced spaghetti into a baking dish. Spread it into an even layer so it bakes uniformly. Sprinkle the remaining mozzarella and Parmesan over the top. That final layer creates the golden, bubbly finish everyone expects from a baked pasta dish.

If you want a little extra browning, keep some cheese a bit heavier in the center and around the edges. That gives the top a nice mix of melty spots and crisp bits.

Seventh Step: Bake until bubbly

Place the dish on the middle rack and bake for 20 minutes. The casserole should become hot all the way through and start bubbling around the edges. If the top needs a little more color, move it to the top rack and broil for 3 to 4 minutes.

Watch closely during broiling because cheese can go from golden to burnt very quickly. A light brown top and bubbling edges are what you are looking for.

Eighth Step: Rest and serve

Take the casserole out of the oven and let it cool for 5 minutes before serving. This short rest helps the sauce settle so the portions hold together better on the plate. Finish with finely chopped parsley leaves if you want a fresh pop of color.

A short resting time may seem small, but it helps the sauce cling better and makes serving much easier.

For a bright contrast to this rich pasta, you could serve a simple salad or even pair dinner with something fun from the sweets section like key lime pie bars.

this …

Dietary Substitutions to Customize Your Alfredo Baked Spaghetti

One of the best things about Alfredo Baked Spaghetti is how easy it is to adapt. Whether you are cooking for picky eaters, adjusting for what is already in the pantry, or changing things for your own needs, a few swaps can keep the dish satisfying.

Protein and Main Component Alternatives

This version is naturally vegetarian, but you can still change the main structure of the dish depending on your table. If you want more protein, add cooked chicken, shrimp, or turkey to the pasta before baking. Rotisserie chicken works especially well when you are short on time.

• Chicken: Fold in diced cooked chicken for a heartier casserole.
• Shrimp: Add cooked shrimp for a seafood-friendly version.
• Vegetarian protein: Try white beans or chickpeas for extra substance.
• Gluten-free pasta: Use your favorite gluten-free spaghetti if wheat is not a fit for your household.

Vegetable, Sauce, and Seasoning Modifications

You can also change the flavor and texture with vegetables or seasoning tweaks. Sautéed mushrooms, spinach, broccoli, or peas all work well mixed into the pasta before baking. A pinch of red pepper flakes can add heat, while extra garlic powder brings a stronger savory note.

• Vegetables: Mushrooms, spinach, broccoli, or peas all fit nicely into the creamy sauce.
• Sauce changes: Use part milk and part half-and-half if you want a slightly lighter sauce.
• Cheese changes: Mix in provolone or fontina for a different melt and flavor profile.
• Herbs: Parsley, basil, or a little thyme can give the dish a fresh finish.

If you enjoy desserts with a homemade feel, you may also like the cozy texture of these soft white cupcakes after dinner.

Mastering Alfredo Baked Spaghetti: Advanced Tips and Variations

Once you have made this casserole once, it gets even easier to make it your own. A few small habits help the texture, flavor, and leftovers stay in great shape.

Pro Techniques

• Cook the spaghetti 1 minute less than the package directions so it finishes perfectly in the oven.
• Use freshly grated Parmesan for a cleaner, more flavorful sauce.
• Grate your own mozzarella if you can, since it melts more smoothly than many pre-shredded bags.
• If you are making it ahead, assemble and refrigerate for up to 2 days or freeze for up to 3 months, then bake covered at 350°F.

Common Mistakes to Avoid

• Do not overcook the pasta before baking, or it may turn too soft.
• Do not rush the sauce thickening step. Thin sauce can make the casserole watery.
• Do not walk away while broiling. Cheese can brown quickly.

Storage and Reheating

Leftovers can be stored in an airtight container in the refrigerator for up to 4 days. When reheating, add a splash of milk to bring back some of the creaminess. If you froze the casserole before baking, thaw it in the fridge overnight before cooking.

Creative Variations

Try mixing in bacon bits, sautéed spinach, mushrooms, or a little ricotta for a richer finish. You can also use a different noodle shape if that is what you have on hand, though spaghetti gives the most classic texture.

Pairing Suggestions

This pasta bake works well with garlic bread, a crisp green salad, or roasted vegetables. If you are planning a bigger meal or a weekend dinner spread, a light appetizer and a simple dessert make the table feel complete.

Nutrition, Serving Notes, and Recipe Snapshot

Each serving of this Alfredo Baked Spaghetti, based on 6 servings, comes in at about 895 calories. It also has 49.0 g fat, 30.1 g saturated fat, 69.4 g carbs, 2.6 g fiber, 10.1 g sugars, 42.8 g protein, and 973.6 mg sodium.

This recipe is tagged as tree-nut-free, pescatarian, alcohol-free, shellfish-free, red-meat-free, pork-free, sulphite-free, soy-free, peanut-free, fish-free, and vegetarian. That makes it useful for many different households and gatherings.

Rich, cheesy pasta is not an everyday light meal, but it is a dependable crowd-pleaser when you want comfort on the table fast.

Frequently Asked Questions

Alfredo Baked Spaghetti

5 Stars 4 Stars 3 Stars 2 Stars 1 Star

No reviews

Print Recipe

Pin Recipe

🍝 Savor the ultimate comfort food with creamy homemade Alfredo sauce baked over tender spaghetti, delivering rich, cheesy goodness in every bite!
🧀 This family-friendly casserole is quick to prep, makes hearty servings for 6, and is perfect for cozy dinners or meal prepping.

• Total Time: 1 hour
• Yield: Serves 6

Ingredients

– 1 pound dried spaghetti noodles for the base of the casserole

– 3 tablespoons unsalted butter for the rich base of the sauce

– 3 tablespoons all-purpose flour to thicken the Alfredo sauce

– 3 cups whole or 2 percent milk for the main liquid in the sauce

– 1 cup heavy cream for body and classic Alfredo richness

– 6 ounces low-moisture mozzarella cheese, shredded and divided for stretchy, melty top and creamy interior

– 4 ounces finely grated Parmesan cheese, divided for salty, nutty flavor

– 1/2 teaspoon garlic powder for gentle savory flavor

– 1 teaspoon kosher salt, plus more for the pasta water for seasoning the sauce and pasta

– Finely chopped parsley leaves, for serving, optional for fresh, bright finish

Cook Mode Prevent your screen from going dark

Instructions

1-First Step: Get the oven and pasta water ready
Arrange the oven racks so one sits in the middle and one near the top. Heat the oven to 375°F. While the oven warms, bring a large pot of heavily salted water to a boil. Salting the water well is important because it seasons the spaghetti from the inside out.
Add 1 pound dried spaghetti noodles and cook them for 1 minute less than al dente according to the package directions. This keeps the pasta firm enough to finish cooking in the oven without turning soft. When the pasta is ready, drain it and set it aside briefly.

2-Second Step: Start the Alfredo sauce
Set a large pot over medium heat and melt 3 tablespoons unsalted butter. Once the butter is melted and foamy, whisk in 3 tablespoons all-purpose flour. Cook this mixture for a short time until it turns lightly golden. That step takes away the raw flour taste and gives the sauce a smoother flavor.
Keep whisking so the mixture does not clump or scorch. You are building the base that will thicken the milk and cream later on.

3-Third Step: Add the milk and cream slowly
Slowly whisk in 3 cups milk and 1 cup heavy cream. Add the liquid in a steady stream and keep whisking while you go. This helps the sauce stay smooth instead of lumpy.
Bring the mixture to a boil, then reduce the heat and let it simmer until it thickens. You want a sauce that coats a spoon, not one that runs thin. If you are new to white sauces, this is the moment to stay close and keep stirring.

4-Fourth Step: Stir in the cheese and seasonings
Take the pot off the heat. Whisk in 4 ounces of the shredded mozzarella, 3 ounces of the grated Parmesan, 1/2 teaspoon garlic powder, and 1 teaspoon kosher salt. The sauce should turn glossy and smooth as the cheese melts.
Taste the sauce if you like, then adjust with a little more salt only if needed. Since Parmesan is naturally salty, a small amount of seasoning often goes a long way. Freshly grated cheese makes the sauce taste better and melt more evenly than shelf-stable pre-shredded versions.

5-Fifth Step: Combine the pasta and sauce
Add the drained spaghetti to the sauce and toss until every strand is coated. Use tongs if you have them, because they make it easier to mix the noodles evenly. You want the sauce to nestle into the pasta, not pool at the bottom of the pan.
If the sauce seems very thick, you can add a small splash of milk to loosen it a little before baking. The pasta should look generously coated and ready for the oven.

6-Sixth Step: Assemble the casserole
Transfer the sauced spaghetti into a baking dish. Spread it into an even layer so it bakes uniformly. Sprinkle the remaining mozzarella and Parmesan over the top. That final layer creates the golden, bubbly finish everyone expects from a baked pasta dish.
If you want a little extra browning, keep some cheese a bit heavier in the center and around the edges. That gives the top a nice mix of melty spots and crisp bits.

7-Seventh Step: Bake until bubbly
Place the dish on the middle rack and bake for 20 minutes. The casserole should become hot all the way through and start bubbling around the edges. If the top needs a little more color, move it to the top rack and broil for 3 to 4 minutes.
Watch closely during broiling because cheese can go from golden to burnt very quickly. A light brown top and bubbling edges are what you are looking for.

8-Eighth Step: Rest and serve
Take the casserole out of the oven and let it cool for 5 minutes before serving. This short rest helps the sauce settle so the portions hold together better on the plate. Finish with finely chopped parsley leaves if you want a fresh pop of color.

Last Step:

Please leave a rating and comment letting us know how you liked this recipe! This helps our business to thrive and continue providing free, high-quality recipes for you.

Notes

🍝 Cook the spaghetti 1 minute less than al dente for the perfect texture after baking.
🧀 Use freshly grated Parmesan and mozzarella for the best melting and flavor.
❄️ Make ahead: Assemble and refrigerate up to 2 days or freeze up to 3 months; bake covered at 350°F from frozen.

• Author: Brandi Oshea
• Prep Time: 15 minutes
• Cooling: 5 minutes
• Cook Time: 40 minutes
• Category: Main Dish
• Method: Boil, Bake, Broil
• Cuisine: Italian-American
• Diet: Vegetarian

Nutrition

• Serving Size: 1/6 recipe
• Calories: 895 kcal
• Sugar: 10.1 g
• Sodium: 974 mg
• Fat: 49 g
• Saturated Fat: 30.1 g
• Unsaturated Fat: 18.9 g
• Trans Fat: 0 g
• Carbohydrates: 69.4 g
• Fiber: 2.6 g
• Protein: 42.8 g
• Cholesterol: 145 mg