Scalloped Potatoes
["1 stick margarine", "4 Tbsp. flour", "1 1/2 c. milk", "1 c. water (off boiled potatoes)", "6 slices cheese", "5 sliced potatoes"]
["Boil potatoes and medium onion; boil until tender.", "Pour water off potatoes except 1 cup.", "Melt margarine; add flour, milk and water off boiled potatoes and salt.", "Cook until thick.", "Pour over sliced potatoes; add cheese, more potatoes, sauce, cheese and more potatoes until all is gone.", "Cook at 350\u00b0 for 1 hour."]
["margarine", "flour", "milk", "water", "cheese", "potatoes"]