Cream shortening and margarine. Add powdered sugar and mix. Add egg yolks and coffee. Mix in flour, salt and baking powder. Add jimmies. Fold in beaten egg whites. Bake in springform pan at 350 degrees for 1 hour.
Frosting: Cream butter, margarine, granulated sugar and powdered sugar well. Add 4 Tbsp. flour, 1 T. at a time. Add 1/2 cup room temperature milk. Beat and add 1 teaspoon vanilla. (May need to warm milk 20 25 seconds in the microwave.)