Bring a pot of salted water to a boil. Add the rigatoni and cook for 8-10 minutes, or until al dente.
Meanwhile, heat the olive oil in a large skillet over medium heat. Add the onion and garlic and cook until softened, about 5 minutes.
Add the marinara sauce, mozzarella cheese, Parmesan cheese, oregano, basil, and salt and pepper. Cook, stirring occasionally, until heated through, about 5 minutes.
Drain the rigatoni and add it to the skillet. Stir to combine.
Serve with additional Parmesan cheese, if desired.
Interesting Facts
This dish is a great way to use up leftover marinara sauce.
Rigatoni is a type of pasta that is larger than penne and has ridges on the outside.
Parmesan cheese is an Italian cheese made from cow's milk.