Peanut Butter-Potato Candy
["1/2 c. mashed potatoes", "1 stick margarine", "2 lb. powdered sugar", "peanut butter"]
["Mix first 3 ingredients well.", "Roll out flat and spread with a thin layer of peanut butter.", "Roll up and chill until firm.", "Slice into 1/4 or 1/2-inch pieces."]
["potatoes", "margarine", "powdered sugar", "peanut butter"]