Mix 1/2 cup of the tomato soup with ground beef, bread crumbs, onion, cheese cubes, egg, salt, and pepper. Shape into a loaf and place in a shallow baking pan. Bake at 350° for about 1 hour and 15 minutes. Blend remaining soup with the water and a tablespoon or two of the pan drippings.
Remove meatloaf to a serving platter; pour some of the sauce over the meatloaf if desired, or serve all of the sauce in a separate dish.
Calories per serving: 370