The secret ingredient that makes this cake so moist is Mayonnaise! Add 3 kinds of chocolate and it’s chocolate indulgence at its highest.
Preheat the oven to 350F. Butter 2 round cake pans (9-inch ones) and line with parchment paper.
Fold in the chocolate chips. Divide the batter evenly between the prepared pans.
Bake in the preheated oven for 20-23 minutes or until a toothpick inserted in the center comes out clean. Oven temperatures vary so adjust the time accordingly. Make sure not to overbake.
Cool the cakes in the pans for 10 minutes and then transfer to a wire rack. Cool the cakes completely before adding the chocolate filling/frosting in between the cakes and coating with the ganache.
Once the cakes have cooled down completely, place one cake onto a serving platter and spread it with some chocolate filling/frosting. Place the other cake on top and then completely coat it with the dark chocolate ganache.