Cook rotini pasta based on the package instructions. Drain and set aside.
Heat olive oil in a large skillet over medium heat. Add finely diced white onion and cook until softened.
Stir in pepperonis cut in half, minced garlic, and Italian seasoning. Cook for 1-2 minutes.
Add marinara sauce and water. Stir to combine and simmer for a few minutes.
Stir in the cooked rotini pasta, shredded mozzarella cheese, and shredded parmesan cheese.
Pour the pasta mixture into a baking dish. Top with the remaining 1 cup shredded mozzarella cheese.
Serve topped with chopped parsley and enjoy!
Notes
*You can use penne pasta instead of rotini if you prefer. *Also, you can easily add any of your favorite pizza toppings to make this meal your own. *Refrigerate the leftovers in an airtight container for up to 5 days.