Tomato and Beef Casserole

1 pount ground beef
1 medium onion, chopped
1 can tomato soup
1/2 cup water
1/2 cup of cooked cut green beans
1 cup cooked medium noodles
1/2 cup shredded cheddar cheese

Brown meat and onions together. Mix with everything else, other than the cheese.  Pour into a 1-quart casserole. Bake at 375 degrees for about 25 minutes. Put cheese on for the last 5-10 minutes of cooking.