01 -
Preheat oven to 375°F. Grease a 9×13 inch baking dish.
02 -
Cook pasta according to package directions until al dente. Drain and set aside.
03 -
In a large skillet, brown Italian sausage over medium heat. Add onion and garlic, cooking until onion is translucent.
04 -
Stir in marinara sauce, diced tomatoes, oregano, basil, salt, and pepper. Simmer for 5 minutes.
05 -
Add the cooked pasta to the sauce mixture in the skillet. Stir to coat pasta evenly.
06 -
Transfer the pasta and sauce mixture to the prepared baking dish. Sprinkle 1/4 cup grated Parmesan cheese evenly over the pasta mixture.
07 -
Top with all 2 cups of shredded mozzarella cheese. Arrange sliced pepperoni over the mozzarella cheese.
08 -
Bake for 25-30 minutes, until cheese is melted and bubbly.
09 -
Let stand for 5 minutes before serving.