For this baked tortellini casserole, I used one large skillet and one casserole pan. I made a quick basic meat sauce with onions, garlic, ground beef and canned tomatoes. But instead of simmering and reducing the sauce, I combined the cheese and fresh uncooked tortellini, and let the entire mixture bake in the oven. Just be sure to keep it tightly covered with foil so it stays moist. The foil keeps the moisture in and cooks the tortellini as it bakes.