Mix all cake ingredients, adding baking soda and flour last. Don't overbeat after adding flour and 04/23/92 8:38 PM buttermilk. Pour into two 9-inch or one 9x12-inch cake grease and floured cake pan. Bake at 350 degrees 35-40 minutes. Icing: 1 stick margerine 1 pound powdered sugar 1 t vanilla 8 oz cream cheese cream or half and half Cream all ingredients together, gradually adding cream until spreading consistency.