Take 1 cake and, with a very sharp knife, cut down the sides at an angle so that it is narrower at the base (to mimic a cupcake case). Slice the cake horizontally and fill with buttercream, spreading it on the top surface too. Take the second cake and place on top. Shape it into a dome, then slice it in half horizontally and fill with buttercream.
Spread a layer of buttercream around the sides of the bottom cake and put the remainder into the piping bag fitted with the star nozzle. Ice the top just as you would a small cupcake.
Arrange the chocolate fingers vertically all around the sides of the cake for the ‘cupcake case’, pressing them into the buttercream. Sprinkle the chocolate coffee beans over the cake and place the candle on top.