Peanut Butter Cake
["1/2 lb. margarine (2 sticks)", "1 c. shortening (Crisco)", "2 2/3 c. granulated sugar", "3 c. cake flour", "1 c. milk", "5 eggs", "2 tsp. vanilla"]
["Beat margarine and shortening until light and creamy.", "Add sugar and beat until creamy.", "Add flour and mix well, adding milk a little at a time.", "Add eggs one at a time, beating after each addition.", "Add vanilla.", "Beat until creamy.", "Pour mixture into three 9-inch cake pans.", "Bake at 325\u00b0 for 30 minutes.", "Frost with:"]
["margarine", "shortening", "sugar", "cake flour", "milk", "eggs", "vanilla"]