This is my recipe for a rather quick and very easy Italian style main dish that is sure to please. I like to make this sometimes with homemade sauce and freshly grated cheeses, but sometimes you want something delicious that doesn't take so much time. It has marinara sauce, pasta shells, ricotta, parmesan and mozzarella... What's not to love? Depending on the sauce you choose to use, it may be either vegetarian or a dish for meat lovers. The recipe may be halved for a smaller group, if desired. Cooking time includes time for boiling the shells. Buon appetito!