This chocolate raspberry truffle cake is taken to the next level with the addition of a creamy mascarpone 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 mascarpone cream filling is made with mascarpone cheese, heavy cream, and powdered sugar, and adds a deliciously creamy element to the cake. Serve it with fresh raspberries and a dusting of cocoa powder for a truly decadent dessert.