Cook butter, Crisco, salt & cocoa then add to above mixture.
Add buttermilk, vanilla and beaten eggs. Mix well and bake in a well greased cookie sheet on 350 degrees for 20 minutes or until done.
Beat icing ingredients together and spread onto cake warm or cold. My cousin likes to add icing to cake when it's warm, she thinks it sticks better. Cut into pieces and place cut piece into a cupcake wrapper n serve or leave as a sheet and cut slices.