To make the recipe as a casserole - After the pasta and sauce are cooked, mix them together and transfer to a casserole dish. Sprinkle the top with cheddar, Parmesan, or Mozzarella cheese (or a combination of any of these) and pop it in the oven at about 350°F (175°C or 165°C for fan ovens) for a few minutes until the cheese melts.