01 -
Bring a large pot of salted water to a boil. Add the rotini and cook until just shy of al dente. Drain and set aside. Do not rinse.
02 -
Heat a large skillet over medium-high heat. Add the ground beef, salt, and pepper. Cook, breaking it up with a spoon, until no longer pink. Drain excess grease and return the meat to the skillet.
03 -
To the skillet add the cooked pasta, pepperoni, marinara sauce, Italian seasoning, cheddar cheese, and 1 cup of mozzarella. Stir until everything is evenly coated.
04 -
Transfer the mixture to a greased 9x13 inch baking dish. Scatter the remaining mozzarella over the top. Bake at 375°F for 25 to 30 minutes, until the cheese is melted and bubbling at the edges.
05 -
Remove from the oven and let the casserole rest for 10 minutes. This helps the sauce set for cleaner scoops. Garnish with fresh parsley if desired.