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Potato-Flour Cake

1/2 cup potato flour 3 teaspoons baking powder 1 teaspoon vanilla Whites of 4 eggs Beat the yolks of the eggs very light with the sugar; add the potato flour and baking powder; flavor; fold in the whites carefully and pour the mixture into a buttered tin. Bake in a very slow oven for about thirty-five minutes. 1 pound butter 1 pound sugar 1 pound flour