Leftover Beef Casserole with Cheese 2 cups diced cooked beef 1 can beef gravy or 1 cup of gravy made from dry mix OR make/use your own 16-oz jar small white onions, drained 10-oz pkg frozen peas and carrots, cooked 1/2 cup shredded sharp cheddar cheese Combine meat with gravy, onions, peas and carrots. Transfer to a buttered 1 1/2 to 2-quart casserole and top with shredded Cheddar cheese. Bake at 350° for 35 minutes. Serves 4. :arizona: