Stir in pasta, water, pasta sauce and pepperoni. Bring a boil and then reduce heat to simmer. Cover and simmer for 20 minutes or until pasta is al dente. Top with shredded cheese.
12 ounces rigatoni pasta, 2 cups water or broth, 2 cups marinara pasta sauce, 1/2 cup pepperoni, 1 cup shredded mozzarella or Parmesan cheese