1.Boil cream, milk and sugar in a small sauce pan. Then pour the mixture into chocolate and gently stir until the chocolate completely melts. Fill a pastry bag fitted with a round tip with the ganache.
2.Place dark couverture in a bowl. Stand the bowl in hot water. Add soft butter and gently stir until well mix.
3.Mix sugar and egg and add in to the batter in 2-3 portions. Fold in sifted flour and baking powder.
4.Pipe cake batter inside silicon mould bottom and side. Fill with chocolate ganache in the middle. Lastly, pipe in cake batter over the chocolate ganache.
5.Bake at 180℃ for 10 minutes.