Easy Creamy Baked Spaghetti Casserole

If you love a hearty pasta dinner, this baked dish is going to become your new obsession.

It takes regular weeknight spaghetti and turns it into something bubbly, cheesy, and completely satisfying. The kind of meal where people hover near the oven waiting for it to come out.

And the secret? Sour cream.

That one simple addition changes everything. It melts right into the marinara, creating a velvety, tangy sauce that coats every single noodle. It feels like something you’d order at a cozy Italian restaurant. But it comes together in your own kitchen with minimal effort.

Whether you’re feeding a crowd, prepping meals for the week, or just craving something deeply comforting, this casserole delivers every single time.

Why You’ll Keep Coming Back to This Recipe

• Incredibly easy prep. A few minutes of active cooking, then the oven takes over completely.
• Perfect for feeding a crowd. One 9×13 dish feeds 8 to 10 people easily, with leftovers you’ll actually look forward to.
• Freezer friendly. Assemble it ahead, wrap it up, and freeze it for those nights when cooking feels like too much.
• Pure comfort food. Melted mozzarella, savory beef, and creamy sauce. It’s basically a warm hug on a plate.

Recipe Timing & Details

Prep Time: 15 minutes | Cook Time: 45 minutes | Total Time: 60 minutes Servings: 8 to 10 | Difficulty: Easy

Ingredients You’ll Need

Nothing fancy here. Just simple, easy-to-find ingredients that come together into something genuinely special.

Ingredient	Quantity	Notes
Spaghetti noodles	1 (16-ounce) package	Any standard brand works perfectly here.
Ground beef	2 pounds	Lean ground beef prevents excessive grease.
Sour cream	1½ cups	Full-fat sour cream yields the creamiest texture.
Garlic salt (with parsley)	1 teaspoon	Adds a savory, aromatic punch to the sauce.
Dried oregano	1 teaspoon	A classic herb essential for Italian-inspired dishes.
Dried basil	1 teaspoon	Brings a hint of sweet, earthy freshness.
Shredded mozzarella cheese	2 cups (divided)	Grate it fresh for the very best melting results.
Parmesan cheese	½ cup	Provides a sharp, salty finish for the topping.
Spaghetti or marinara sauce	2 (26.5-ounce) jars	Pick your favorite store-bought brand.

Let’s Get Cooking

Alright, let’s get into it. I promise this is as stress-free as pasta bakes get.

Step-by-Step Instructions

1. Prep Your Station

Start by preheating your oven to 350°F. Grab a large 9×13 baking dish and give it a quick spray with non-stick cooking spray. You don’t want any of that gorgeous pasta sticking to the bottom. Set it aside.

2. Boil the Pasta

Bring a large pot of generously salted water to a rolling boil. Add your full 16-ounce package of spaghetti. Here’s the key thing though: cook it strictly to al dente. Check your package directions, then subtract about two minutes from the suggested time.

Why? Because the pasta keeps cooking in the oven. Overcooked noodles at this stage means mushy casserole at the end. Drain well and set aside.

3. Brown the Ground Beef

While your pasta is going, place a large deep skillet over medium-high heat. Add the 2 pounds of ground beef. Break it apart with a wooden spoon and stir it frequently until there’s no pink left anywhere. Drain the excess grease carefully, then return the beef to the skillet.

4. Create the Creamy Sauce

This is the step where everything clicks.

Lower the heat to medium. Pour both jars of spaghetti sauce right into the skillet with the beef. Now stir in the 1½ cups of sour cream. Add your garlic salt, dried oregano, and dried basil. Keep stirring until the sour cream dissolves completely into the red sauce.

Watch what happens. The sauce shifts from bright red to a beautiful, rich blush color. That’s when you know you’ve nailed it.

5. Combine Pasta and Sauce

Add your drained al dente spaghetti directly into the bubbling meat sauce. Sprinkle in 1 cup of the shredded mozzarella. Use tongs to toss everything together gently until every noodle is coated in that creamy, savory sauce.

6. Assemble the Casserole

Pour the entire spaghetti mixture into your prepared 9×13 baking dish. Spread it out evenly with a spatula. Sprinkle the remaining 1 cup of mozzarella over the top. Follow that with the ½ cup of parmesan.

Don’t be shy with the cheese. You want full, even coverage.

7. The Two-Step Bake

Cover the dish tightly with aluminum foil. Bake on the center rack for 30 minutes. The foil traps steam and keeps the noodles moist and tender the whole time.

After 30 minutes, carefully remove the foil. Slide the dish back in for another 10 to 15 minutes. You’re looking for cheese that’s bubbly, golden, and just starting to blister at the edges. That’s your signal.

My Personal Chef Tips for Success

A few things I’ve learned from making this more times than I can count:

• Break the noodles before boiling. Snap the dry spaghetti in half before it hits the water. Shorter noodles make the casserole dramatically easier to slice and serve cleanly.
• Do not overcook the pasta. Seriously. I can’t stress this enough. Two minutes under is always better than two minutes over at the boiling stage.
• Grate your own cheese. Pre-shredded bagged mozzarella is coated in anti-caking powder. That powder is what makes it melt unevenly. A fresh block grated at home gives you that gorgeous, stretchy pull every time.
• Let it rest before cutting. Pull the dish from the oven and resist the urge to dig in immediately. Give it a full 10 minutes. The creamy sauce firms up, the layers set, and you get those beautiful, clean slices.

Storage and Make-Ahead Instructions

To Refrigerate: Let the casserole cool completely to room temperature first. Transfer slices into an airtight container and refrigerate for up to four days. Reheat individual portions in the microwave for about two minutes.

To Freeze (Unbaked): Assemble the whole casserole but don’t bake it yet. Let the sauce cool down first. Wrap the dish tightly in one layer of plastic wrap, then add a second layer of aluminum foil. Freeze for up to three months. Thaw overnight in the fridge before baking as directed.

To Freeze (Baked): Already baked and have leftovers? Wrap individual cooled slices in foil and drop them in a freezer bag. They make for a genuinely satisfying quick lunch on a hectic workday.

Frequently Asked Questions

Can I use a different type of meat?

Absolutely. Ground beef gives you that classic, hearty base. But ground turkey or ground chicken work beautifully as lighter alternatives. A 50/50 mix of ground beef and mild ground sausage is also really good if you want a little extra depth of flavor.

Can I sneak extra vegetables into this?

This casserole is a great hiding spot for vegetables. Finely dice some onions, bell peppers, or mushrooms and sauté them right alongside the ground beef. You can also stir in a handful of fresh spinach when you add the pasta. It wilts down completely and nobody will notice.

Why sour cream instead of ricotta?

Ricotta is the traditional choice in most baked pasta dishes. But it can turn grainy or dry when it bakes. Sour cream behaves completely differently. It melts seamlessly into the hot marinara, creating a smooth, tangy, velvety texture that clings to every noodle without clumping or separating.

Can I swap out the spaghetti for a different pasta shape?

Yes. Spaghetti is the classic choice here, but any sturdy pasta shape holds up well. Penne, rigatoni, ziti, or rotini all grab onto that creamy meat sauce just as effectively. Just be sure to pull them out of the water slightly before al dente, same as you would with the spaghetti.

My sauce looks too thick. What do I do?

Different jarred marinara brands have different moisture levels. If your sauce looks too thick in the skillet before you add the pasta, don’t stress about it. Just splash in about a quarter cup of warm water or beef broth and stir it through until you hit the right consistency. Easy fix.