1 c. diced, cooked ham
2 tbsp. chopped onion
1 tbsp. butter
1 can cream of mushroom soup
1/2 c. water
1 c. sharp cheddar cheese
6 oz. cooked spaghetti

Brown ham and onion in butter. Add remaining ingredients except spaghetti. Cook over low heat until cheese melts. Add spaghetti, heat thoroughly.