Spice Cake
["6 c. butter", "6 lb. sugar", "2 doz. eggs, separated", "6 c. mashed potatoes", "3 qt. flour", "4 Tbsp. baking powder", "8 tsp. cinnamon", "8 tsp. nutmeg", "8 tsp. cloves", "4 tsp. salt", "3 1/2 c. milk"]
["Preheat oven to 350\u00b0.", "Cream butter and gradually add sugar, beating until fluffy.", "Add egg yolks and beat 2 minutes.", "Add potatoes and heat until smooth.", "Sift dry ingredients together and add alternately with milk to potato mixture.", "Blend well.", "Fold in beaten egg whites.", "Put in greased loaf pans, 10 1/2 x 16 1/2-inches.", "Bake about 40 minutes.", "Can be served warm with a dab of whipped cream or frost with your favorite icing.", "Serves 100."]
["butter", "sugar", "eggs", "potatoes", "flour", "baking powder", "cinnamon", "nutmeg", "cloves", "salt", "milk"]