This chocolate raspberry truffle cake is taken to the next level with the addition of a creamy white chocolate mousse filling. The recipe uses a rich chocolate cake batter that's filled with a raspberry truffle filling and topped with a smooth chocolate ganache. The white chocolate mousse filling is made with white chocolate, heavy cream, and cream cheese, and adds a deliciously creamy element to the cake. Serve it with fresh raspberries and a dusting of powdered sugar for a truly decadent dessert.