Stuffed Rigatoni is simply rigatoni pasta that has been stuffed with a filling. The filling for stuffed rigatoni usually contains a soft cheese like ricotta or goat cheese. In addition to the cheese, egg and spinach are also popular. Stuffed rigatoni is often known as baked rigatoni because it's usually baked like a pie in a spring form pan with the rigatoni stacked upwards. It can also be baked in a cast iron pan like lasagna. It's usually coated with marinara sauce and topped with mozzarella and parmesan cheese.