Grandma Berrett's Homeade Potatoes Augraten

6 cups boiled, cooked and diced potatoes (Usually boil them before and let them sit because it takes a while for them to cool before you peel them to make the potatoes)
( I usually double the recipe for two 9 by 13 containers of stuff )

Make a white sauce in heavy pan with 6 TBS of flour and 6 TBS melted butter

Bubble flour into butter, slowly add 3 cups of milk. Cook until thickens, stiring constantly one minute before removing from the heat.

Add 1 TBS small, diced onion dehydrated. 2 tsp of salt and 2 TBS chopped parsley. Grate 2 cups of cheese and add to white sauce. Pour sauce over potatoes. and stir until well mixed. Grate 1/2 cup of cheese and put on top

Cook 350 for 30 minutes. Enjoy.