1All ingredients should be room temperature. Preheat oven to 325 degrees In a mixer cream together shortening and margarine then add sugar. Mix until well blended ,slowly add eggs one at a time. Blend with your mixer on medium for about 5 minutes. Sift together all your dry ingredients. Turn your mixer on low..slowly add your flour mixture. Alternate flour mixture and milk until well blended. After flour mixture & milk are mixed in, add vanilla and your desired flavoring. Turn up your mixer to medium and blend for another 5 min. Pour batter evenly into a large deep tube pan and bake at 325 degrees for 1hr then increase temperature to 350 and bake an additional 15min. or til done. Check for doneness with toothpick or knife. Insert into middle of cake, if it comes out clean it's done.