This chocolate raspberry truffle cake with chocolate buttercream frosting is perfect for those who love the rich flavor of chocolate. The cake is made with a chocolate cake mix, raspberry jam, and a chocolate buttercream frosting. To make the cake, simply follow the instructions on the cake mix box and bake the cake in two 9-inch round pans. Once the cake has cooled, spread raspberry jam between the layers and cover the cake with a chocolate buttercream frosting made with butter, powdered sugar, cocoa powder, and vanilla extract. Garnish with fresh raspberries and enjoy!