Now take advantage of the time you have while the cake is cooling and start on your icing!. You can use any icing you wish but my mother in law loves butter cream icing on anything! So for her I thought that would be a good fit for this very moist cake. Simply place your softened butter (should have one stick left) in a mixing bowl and beat it until creamy. Add the two HEAPING tablespoons of the special dark chocolate cocoa powder, a touch of brown sugar (maybe half a tsp.), 1/3 cups confectioners sugar, 1 tsp. vanilla extract and beat well! The icing will be thick! Put in fridge while cake is cooling so the butter does not lose it's consistency.