Easy Pizza Casserole with Melty Mozzarella and Pepperoni Step-by-step instructions

Before you start

Before you begin cooking, gather all of your ingredients and equipment to ensure a smooth and efficient process. Measure out the pasta, cheese, and pepperoni, and have your marinara sauce jar ready to open.

Set up your large pot for boiling the pasta, a colander in the sink for draining, and a large skillet for browning the meat. Grease your 9x13-inch glass baking dish lightly with cooking spray or olive oil, and preheat your oven to 375°F (190°C) so it is ready to bake as soon as assembly is complete.

Instructions

Prep and Cook Pasta and Beef

1. 1Boil the Pasta
   Bring a large pot of salted water to a rolling boil over high heat. Add the dry penne pasta and cook according to the package instructions until it reaches a perfect al dente texture, which usually takes about 9 to 11 minutes. Drain the pasta thoroughly in a colander and set it aside.
   Look for The pasta should be tender but still retain a slight bite in the center.
   Tip Do not overcook the pasta, as it will continue to cook and soften further while baking in the oven.
2. 2Brown the Meat
   Heat a large skillet over medium-high heat. Add the ground beef, breaking it up into small crumbles with a wooden spoon as it cooks. Cook the beef thoroughly for 6 to 8 minutes until it is completely browned and has reached a safe internal temperature of 160°F (71°C). Drain any excess grease from the skillet.
   Look for The beef should be evenly browned with no traces of pink remaining.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip Use a slotted spoon to transfer the cooked beef to a plate lined with paper towels to drain excess fat.

At the end of this initial phase, the penne pasta should be drained and steaming, holding its shape perfectly with a firm center. The ground beef should be fully cooked to a safe 160°F (71°C), showing a rich, deep brown color with no pink spots remaining. The savory aroma of seasoned meat and boiling pasta should fill your kitchen, indicating that your foundational components are ready for assembly.

Combine and Assemble Casserole

3. 3Combine Sauce and Pasta
   Pour the marinara sauce directly into the skillet with the cooked beef, stirring well to combine. Reduce the heat to low and let the meat sauce simmer gently for 2 to 3 minutes. Add the cooked and drained penne pasta to the skillet, tossing everything together until the pasta is evenly coated in the rich meat marinara.
   Look for The pasta should be completely covered in a thick, steaming coat of savory meat sauce.
   Tip If your skillet is too small, combine the pasta, beef, and marinara sauce back in the large pasta pot.
4. 4Assemble the Casserole
   Preheat the oven to 375°F (190°C). Lightly grease a 9x13-inch glass baking dish. Transfer the saucy pasta mixture into the prepared dish, spreading it into an even layer. Evenly sprinkle the shredded mozzarella cheese over the top, then arrange the pepperoni slices in a single layer across the cheese.
   Look for The pepperoni should be distributed evenly so every bite gets a perfect slice.
   Tip Press the pepperoni slices gently into the cheese layer to keep them from curling up too much during baking.

By the end of the assembly phase, the pasta and savory meat sauce should be completely combined, creating a thick, uniform mixture that fills the baking dish.

The top of the casserole should be entirely covered by an even layer of shredded mozzarella cheese, beautifully dotted with pepperoni slices. The dish is now ready to enter the hot oven, with the ingredients arranged perfectly to melt and crisp.

Bake and Cool Casserole

5. 5Bake to Perfection
   Place the baking dish in the preheated oven and bake for 20 to 25 minutes. The cheese should be completely melted, bubbly, and beautifully browned around the edges, while the pepperoni slices become crispy. Remove the casserole from the oven and let it rest for 5 to 10 minutes before serving.
   Look for The cheese should bubble vigorously and show deep golden brown spots.
   Tip Letting the casserole rest helps the sauce settle, making it much easier to scoop and serve clean portions.

When you pull the casserole from the oven, the cheese should be completely melted, bubbling vigorously around the edges, and showing beautiful golden-brown patches. The pepperoni slices should be slightly cupped with crispy, darkened edges, releasing a savory aroma. Let the dish rest on a heatproof surface for 5 to 10 minutes to allow the sauce to set before slicing.

Common mistakes

One of the most common mistakes is overcooking the pasta during the boiling stage. Because the pasta undergoes a second cooking process in the oven, starting with overcooked noodles will result in a soft, mushy casserole.

Another frequent error is failing to drain the fat from the browned meat, which can lead to a greasy layer pooling on top of your baked cheese. Always drain the beef well before mixing it with the marinara.

How to tell it’s done

You will know this pizza casserole is perfectly cooked when the cheese is completely melted, bubbly, and golden brown, and the pepperoni edges are crisp.

To guarantee absolute food safety, ensure that the ground beef has been thoroughly cooked to an internal temperature of 160°F (71°C) before it is combined with the sauce and baked. The final bake in the oven should take about 20 to 25 minutes to heat everything through and melt the cheese.

• Ground meat: 160°F (71°C) in the thickest part