Mashed Potato Doughnuts
["2 c. mashed potatoes", "1 1/2 c. granulated sugar", "2 eggs", "1 c. milk", "4 Tbsp. melted shortening", "4 tsp. baking powder", "4 to 6 c. flour", "pinch of salt"]
["Mix enough flour to roll well.", "Roll out and cut.", "Fry in deep oil; Crisco would be a very good oil."]
["potatoes", "sugar", "eggs", "milk", "shortening", "baking powder", "flour", "salt"]