Marie's Noodle Surprise

1 small pkg. noodles
1 lb. ground beef
1 small onion, chopped
Salt and pepper to taste
1 can mushroom soup
1 scant soup can hot water
Cheese as desired

Cook noodles and drain. Brown hamburger and onion, season to taste. Place hamburger and noodles alternately in greased baking dish. Pour mushroom soup and hot water over all. Top with cheese slices if desired. Bake 40 minutes at 350 degrees.