Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   6 1/2  ounces        Water-packed tuna
     1/2  cup           Onion -- diced
   6      ounces        Egg noodles
   1      can           Light cream of mushroom soup
                        No Salt -- to taste
                        to            taste
   2      slices        Light sandwich cheese

Preparation:

Cook noodles; drain. Mix in all ingredients and top with the cheese. Bake at 350 degrees for about 45 minutes to 1 hour.