Pizza Spaghetti Casserole

Comfort food meets weeknight simplicity in this cheerful one-dish meal: Pizza Spaghetti Casserole. Think of it as your favorite pizza flavors—tangy tomato sauce, melty mozzarella, and pepperoni—married to tender spaghetti and baked until bubbling and golden. It’s the kind of supper that makes everyone at the table smile, requires minimal prep, and stretches to feed a family or provide delicious leftovers for the next day. Whether you’re cooking for a busy weeknight or a relaxed weekend dinner, this casserole delivers cozy, familiar flavors with hardly any fuss.

Before we dive in, a quick note on the components you’ll find in this version: a full package of spaghetti noodles (17.6 oz), one and a half jars of spaghetti sauce (24 oz jars), two cups of Horizon Organic mozzarella cheese, and one package of pepperoni. These straightforward pantry-friendly ingredients keep the process uncomplicated and the result reliably tasty.

Why this Pizza Spaghetti Casserole works

This recipe takes advantage of three simple ideas. First, boiling the spaghetti just shy of al dente ensures it finishes cooking in the oven without becoming mushy. Second, using a generous amount of sauce guarantees every forkful tastes like pizza—bright tomatoes and herbs. Third, layering cheese and pepperoni on top creates that classic pizza finish: melted, slightly browned cheese with crisped pepperoni edges. The combination is satisfying, familiar, and perfect for feeding a crowd.

Ingredients

• 1 package spaghetti noodles (17.6 oz package)
• 1.5 jars spaghetti sauce (24 oz jars)
• 2 cups Horizon Organic mozzarella cheese
• 1 package pepperoni

Equipment

• Large pot for boiling pasta
• Colander
• Mixing spoon or tongs
• 9×13-inch baking dish (or similar sized casserole dish)
• Aluminum foil (optional)
• Oven mitts

Prep and timing

Active time: about 20–30 minutes. Total time with baking: around 45–55 minutes. This recipe yields 6–8 servings depending on portion size. Prep time is short because most of the hands-on work is boiling, stirring, and assembling—perfect for a busy household.

Flavor tips and variations

Here are some small changes you can make to personalize this casserole without adding complexity:

• Vegetables: Stir in a cup of sautéed bell peppers or mushrooms to add freshness and texture.
• Spice: Add a pinch of red pepper flakes to the sauce for heat, or a teaspoon of Italian seasoning for extra herbiness.
• Cheese blend: Swap half the mozzarella for a cup of shredded cheddar for a tangier finish.
• Sausage swap: Replace pepperoni with thinly sliced cooked chicken sausage or turkey pepperoni for a different protein profile.

Step-by-step instructions

Follow these clear, ordered steps to turn your ingredients into a bubbling, pizza-flavored casserole.

1. Preheat the oven to 350°F (175°C). This ensures the oven is ready when the casserole goes in and helps the cheese melt evenly.
2. Bring a large pot of salted water to a rolling boil. Use plenty of water so the spaghetti cooks evenly and doesn’t stick together.
3. Add the entire package of spaghetti noodles (17.6 oz) to the boiling water. Cook the noodles according to the package directions but stop about 1–2 minutes before they reach al dente; they should still have a slight bite because they will finish cooking in the oven.
4. Drain the spaghetti in a colander and return it to the pot or a large mixing bowl. Allow it to cool just enough so it’s safe to handle and won’t melt the sauce when mixed.
5. Pour 1.5 jars of spaghetti sauce (24 oz jars) over the drained spaghetti. Toss gently with a mixing spoon or tongs until the noodles are evenly coated. You want every strand to be saucy so each bite tastes like pizza.
6. Transfer the sauced spaghetti to a 9×13-inch baking dish (or similar casserole dish). Spread it out evenly so the surface is flat and will brown uniformly in the oven.
7. Sprinkle the top of the spaghetti with 2 cups of Horizon Organic mozzarella cheese, distributing it so that most of the surface is covered. The cheese will melt and form the pizza-like topping.
8. Arrange the pepperoni across the cheese layer from the package of pepperoni. Place slices evenly so every serving receives some pepperoni. If you prefer crispier edges, arrange the pepperoni so it slightly overlaps the cheese instead of being fully on top.
9. Cover the baking dish loosely with aluminum foil if you want a softer top, or leave it uncovered for a browned, slightly crispy cheese finish. Place the casserole in the preheated oven.
10. Bake the casserole for 20–25 minutes, until the cheese is melted, bubbling, and lightly golden. If you left it uncovered, check at 18 minutes so the cheese doesn’t over-brown.
11. Remove the casserole from the oven and let it rest for 5–10 minutes. Resting helps the flavors settle and makes slicing easier so the portions hold together.
12. Slice and serve directly from the baking dish. Pass any extra sauce or red pepper flakes at the table for those who like a little more zip.

Serving suggestions

Serve this Pizza Spaghetti Casserole with a simple green salad dressed in a bright vinaigrette to balance the richness of the cheese. Garlic bread or a crisp baguette makes a lovely side for scooping up any leftover sauce. For a lighter option, pair one portion with a steamed vegetable like broccoli or roasted zucchini.

Storage and reheating

Leftovers keep well in the refrigerator for 3–4 days when stored in an airtight container. To reheat, place individual portions on a microwave-safe plate and heat for 1–2 minutes, or warm in a 350°F oven for 10–15 minutes until heated through. If frozen, the casserole holds up to 2 months; thaw overnight in the refrigerator before reheating.

Notes on ingredients and substitutions

• Spaghetti noodles: The recipe uses a full 17.6 oz package. If you prefer a different shape—penne, rigatoni, or rotini—those work too, but cooking times may vary slightly for al dente texture.
• Spaghetti sauce: 1.5 jars (24 oz jars) is written to provide a generous coating; if you like your pasta saucier, add the remaining half-jar on the side or mix it in before baking.
• Mozzarella cheese: Two cups of shredded Horizon Organic mozzarella provide that classic melty texture and mild flavor. You can substitute a low-moisture mozzarella or mix with provolone for a slightly sharper taste.
• Pepperoni: Use the package of pepperoni as directed. If you’d rather have crispier meat, place slices under the broiler for 30–60 seconds just before removing the dish from the oven, watching closely so they don’t burn.

Why the ingredient amounts matter

The specified amounts give you a balanced casserole where the spaghetti, sauce, cheese, and pepperoni are in harmony. The 17.6 oz of pasta is a standard large package that fills the baking dish nicely. The 1.5 jars of sauce ensure every strand is coated without leaving the finished dish too wet. Two cups of cheese provide an indulgent, melty layer without overpowering the pasta. Finally, the single package of pepperoni distributes flavor evenly across the casserole.

Make-ahead tips

You can assemble the casserole up to a day ahead. Store it covered in the refrigerator and bake it from chilled, adding a few extra minutes to the bake time until the center is heated through and the cheese is bubbly. This is a great option for busy evenings when you want dinner ready with minimal last-minute prep.

Final thoughts

Pizza Spaghetti Casserole is the kind of straightforward comfort dish that brings familiar flavors and effortless satisfaction. It’s forgiving, easy to scale, and a lovely bridge between two beloved classics: pizza and spaghetti. With simple ingredients from the pantry and a short list of steps, you’ll have a warm, cheesy, universally-loved meal on the table in under an hour. Treat it as a base for experimentation—add vegetables, change up the cheese, or try different protein slices—but don’t be afraid to enjoy it exactly as written: reliably delicious, uncomplicated, and perfect for any day of the week.

Ready to bake? Gather your spaghetti, sauce, cheese, and pepperoni, and get started—this is a recipe that rewards minimal hands-on time with maximum crowd-pleasing flavor.