Use the 20.5 cup sized boxes of mashed potatoes Heat 9 cups water in a pot with the onion soup mix. Simmer until the soup is cooked. While the soup mixture is cooking, mix 1 cup of water with 1 cup dry milk. Open the can of corned beef. When the soup is cooked, add the corned beef cut into pieces and stir in the milk mixture. Add the stick of margarine and stir untl the margarine is melted. Remove the pan from heat and stir in the box of mashed potato flakes. Stir to distribute the flakes through the liquid. Let set a few minutes to allow the potatoes to soak up the moisture. Grated cheese can be spread on the top before serving. Good served with scrambled eggs A richer flavor can be obtained with non-dairy creamer added to the "smash". Recipe By : Troop 21