As I said, you can use any pasta for this, even ravioli. You can add cooked chicken (Shredded/pulled apart leftovers work fine), Sauteed, lightly seasoned ground beef works fantastic with this. You can add steamed vegetables. I kept it simple, but ever so often I'd add blanched broccoli or spinach. You can use a microwave safe dish, and since everything is cooked, just heat it in the microwave for about 4-5 minutes, or until the cheese looks completely melted.