Potato Chocolate Cake
["1 c. hot, unseasoned mashed potatoes", "2 c. sugar", "2/3 c. shortening", "4 eggs (unbeaten)", "1 tsp. vanilla", "2 c. sifted all-purpose flour", "1/2 c. cocoa", "3 tsp. baking powder", "1 tsp. each: cinnamon and nutmeg", "1/2 tsp. salt", "1/2 c. milk", "1 c. chopped walnuts"]
["Heat oven to 350\u00b0.", "Line bottoms of 2 (9-inch) layer pans or a 13 x 9 x 2-inch oblong pan with waxed paper cut to fit.", "Prepare mashed potatoes.", "(Easy way is to follow directions for 2 servings on package mashed potatoes.) Measure and set aside.", "Gradually beat sugar into shortening until fluffy.", "Add eggs, one at a time, beating well.", "Add vanilla and potatoes.", "Add sifted dry ingredients and milk alternately, about 1/4 of each at a time, beating smooth.", "Stir in walnuts."]
["potatoes", "sugar", "shortening", "eggs", "vanilla", "flour", "cocoa", "baking powder", "cinnamon", "salt", "milk", "walnuts"]