Cheesy Spaghetti – Creamy 30-Minute Comfort Dinner

Cheesy Spaghetti is what happens when you take a humble box of spaghetti and treat it like the star of a baked pasta casserole. Think of the sauce as a warm blanket: a silky cheese sauce clings to every strand, then a hot oven turns the top into a golden, slightly crisp lid you have to crack with a fork.

The technique is simple, but timing matters. Pasta keeps cooking after it leaves the water, a process called carryover cooking, so we pull it one minute shy of al dente. That small pause is the difference between tender strands and mushy ones, the same way a steak resting off the grill finishes gently instead of overcooking.

This is a weeknight-friendly dish that still feels like a Sunday supper. You will build a roux, melt the cheese off the heat so it stays smooth, toss everything together, and bake until the edges bubble. Stay curious, stay safe.

About the Ingredients

1 lb (454 g) spaghetti

Use regular dried spaghetti, not fresh, so it holds up in the oven. A good substitution is linguine or bucatini if you want a thicker chew.

4 tbsp (56 g) unsalted butter

Butter gives the roux a nutty base; salted butter works if you cut the added salt in half. Buy European-style butter for a richer flavor if your store carries it.

4 tbsp (32 g) all-purpose flour

Flour thickens the milk into a sauce, like a gentle glue that holds the cheese in place. For a gluten-free version, use an equal amount of cornstarch.

3 cups (710 ml) whole milk, warmed

Warm milk blends into the roux without lumps; 2 percent works but gives a thinner sauce. For a richer result, swap in half-and-half for one cup of the milk.

2 cups (226 g) shredded low-moisture mozzarella

Low-moisture mozzarella melts into long, stretchy strands instead of releasing water. Fresh mozzarella is delicious but watery, so drain and pat it dry before using.

1 1/2 cups (170 g) shredded sharp cheddar

Sharp cheddar adds a tangy backbone; medium cheddar is milder for kids. Buy blocks and shred them yourself because pre-shredded cheese is coated with starch that resists melting.

1/2 cup (50 g) finely grated parmesan

Parmesan brings salty, savory depth and helps the top brown. Pecorino Romano is a sharper, saltier substitute, so reduce the added salt if you use it.

1 tsp garlic powder

Garlic powder spreads even flavor without chunks; 2 minced fresh cloves work too. Add fresh garlic to the butter first and cook 30 seconds before the flour.

1/2 tsp kosher salt, plus more for the pasta water

Kosher salt seasons gently; table salt is twice as salty by volume, so use half. Taste the sauce before baking because cheese adds salt too.

1/4 tsp freshly ground black pepper

Fresh pepper adds a warm bite; white pepper keeps the sauce visually clean. Grind it right before adding for the strongest aroma.

2 tbsp (28 g) extra butter, melted, for the top

Brushing melted butter on top encourages browning and a subtle crisp edge. Olive oil works as a substitute but browns a little faster.

2 tbsp panko breadcrumbs

Panko creates a light, crunchy crust; regular breadcrumbs are denser. For a gluten-free topping, use crushed gluten-free cornflakes.

Tips & Tricks

Pull the pasta early

Boil spaghetti one minute less than the package says, because it finishes cooking in the hot oven and absorbs sauce.

Melt cheese off the heat

Add shredded cheese only after the pot leaves the burner, since high heat makes cheese break into greasy clumps, a problem called seizing.

Season the water like the sea

Use about 1 tablespoon of kosher salt per gallon of water so the pasta itself tastes seasoned, not just the sauce.

Let it rest before serving

Wait 10 minutes after baking so the sauce sets and the slices hold together instead of running across the plate.

Step-by-Step Instructions

1. Heat Oven and Boil Pasta

Heat the oven to 375 F (190 C). Boil the spaghetti in well-salted water for 1 minute less than the package directs, about 9 minutes, until it bends but still has a firm bite at the center; drain and set aside.

2. Make the Roux

In a large oven-safe skillet, melt 4 tablespoons of butter over medium heat, about 1 minute, until it foams but does not brown. Whisk in the flour and cook for 1 to 2 minutes, stirring constantly, until the mixture smells toasty and looks like wet sand.

3. Build the Sauce

Pour in the warm milk in a steady stream while whisking, then add garlic powder, salt, and pepper. Simmer for 3 to 4 minutes, whisking, until the sauce coats the back of a spoon and no flour taste remains.

4. Melt the Cheese

Remove the skillet from the heat and stir in the mozzarella, cheddar, and parmesan in three additions, stirring until each melts before adding more. The sauce should look glossy and drip slowly off the whisk.

5. Combine Pasta and Sauce

Add the drained spaghetti to the skillet and toss with tongs for 1 to 2 minutes until every strand is coated and the sauce pools slightly at the bottom. If it looks thick, splash in reserved pasta water one tablespoon at a time.

6. Top and Bake

Brush the top with 2 tablespoons melted butter, then scatter the panko over the surface. Bake at 375 F (190 C) for 20 to 25 minutes, until the edges bubble and the top is golden brown, about 2 minutes longer for a deeper crust.

7. Rest and Serve

The center should read 165 F (74 C) on an instant-read thermometer, and the cheese should pull into stretchy strands when a fork lifts the top. Rest 10 minutes, then serve hot.

Delicious Variations

Spicy Sausage Cheesy Spaghetti

Brown 12 ounces of hot Italian sausage in the skillet first, then build the sauce in the drippings for a smoky, spicy kick.

Chicken Alfredo Cheesy Spaghetti

Fold in 2 cups of shredded rotisserie chicken and swap the cheddar for an extra cup of parmesan for a milder, creamier bake.

Baked Cheesy Spaghetti Bites

Press the cooled mixture into a greased muffin tin, top with extra panko, and bake at 400 F (200 C) for 15 minutes for pull-apart party bites.

How to Store Cheesy Spaghetti

Frequently Asked Questions

Grab your biggest skillet, shred the cheese fresh, and give this cheesy spaghetti a try this week. Once you nail the sauce-to-pasta ratio, you can bend the recipe toward whatever your family loves. Stay curious, stay safe.

Cheesy Spaghetti

Cheesy Spaghetti turns a pound of pasta into a creamy, bubbling baked casserole with three cheeses and a golden crisp top.

★★★★½ 4.8 (214 ratings)

15 minPrep time35 minCook time6Servings612 kcalCalories

Print RecipePin Recipe

🧂 Ingredients

• 1 lb (454 g) spaghetti
• 4 tbsp (56 g) unsalted butter
• 4 tbsp (32 g) all-purpose flour
• 3 cups (710 ml) whole milk, warmed
• 2 cups (226 g) shredded low-moisture mozzarella
• 1 1/2 cups (170 g) shredded sharp cheddar
• 1/2 cup (50 g) finely grated parmesan
• 1 tsp garlic powder
• 1/2 tsp kosher salt, plus more for the pasta water
• 1/4 tsp freshly ground black pepper
• 2 tbsp (28 g) extra butter, melted, for the top
• 2 tbsp panko breadcrumbs

📋 Instructions

1. 1Heat Oven and Boil Pasta — Heat the oven to 375 F (190 C). Boil the spaghetti in well-salted water for 1 minute less than the package directs, about 9 minutes, until it bends but still has a firm bite at the center; drain and set aside.
2. 2Make the Roux — In a large oven-safe skillet, melt 4 tablespoons of butter over medium heat, about 1 minute, until it foams but does not brown. Whisk in the flour and cook for 1 to 2 minutes, stirring constantly, until the mixture smells toasty and looks like wet sand.
3. 3Build the Sauce — Pour in the warm milk in a steady stream while whisking, then add garlic powder, salt, and pepper. Simmer for 3 to 4 minutes, whisking, until the sauce coats the back of a spoon and no flour taste remains.
4. 4Melt the Cheese — Remove the skillet from the heat and stir in the mozzarella, cheddar, and parmesan in three additions, stirring until each melts before adding more. The sauce should look glossy and drip slowly off the whisk.
5. 5Combine Pasta and Sauce — Add the drained spaghetti to the skillet and toss with tongs for 1 to 2 minutes until every strand is coated and the sauce pools slightly at the bottom. If it looks thick, splash in reserved pasta water one tablespoon at a time.
6. 6Top and Bake — Brush the top with 2 tablespoons melted butter, then scatter the panko over the surface. Bake at 375 F (190 C) for 20 to 25 minutes, until the edges bubble and the top is golden brown, about 2 minutes longer for a deeper crust.
7. 7Rest and Serve — The center should read 165 F (74 C) on an instant-read thermometer, and the cheese should pull into stretchy strands when a fork lifts the top. Rest 10 minutes, then serve hot.

👨‍🍳 Chef's Note: A wide oven-safe skillet gives more surface area, which means more golden crust per serving, so use your largest one or transfer everything to a 9×13-inch baking dish.

Servings: 6

Cuisine: American-Italian

Course: Main Course

Nutrition (per serving): 612 kcal · 27g protein · 66g carbs · 27g fat

Written by Ethan Hale
Ethan writes about technology and digital privacy, focusing on how to protect your online identity without being a tech expert. He translates complex security concepts into everyday language and practical steps.