Step 1

Start by preheating the oven to 350°F. Then grease two 9-inch cake pans and set them aside.

Step 2

Next in a large bowl combine the cake mix, eggs, melted butter, and milk. Beat ingredients with an electric mixer for 2 minutes on medium speed.

Step 3

Divide the batter evenly between the 2 pans. Place them in the preheated oven and bake for 20 minutes or until a toothpick inserted in the middle comes out clean. Let the cakes cool completely before adding the filling and frosting. This generally takes 2-3 hours.

Step 4

When the cakes are cooled, prepare the filling. In a large bowl combine the heavy whipping cream and the dry instant pudding mix. Using an electric mixer beat the ingredients until combined and fluffy.

Step 5

Place one cooled cake layer on a large plate or cake stand. Top with all the chocolate mousse, and then place the other cake layer on top of it. Gently cover the cake with plastic wrap and place it in the fridge while you prepare the chocolate frosting.

Step 6

Next in a microwave safe bowl, melt the corn syrup and chocolate chips for 1:30 in the microwave. Stir gently, then add time in 30 second intervals until the chocolate chips are all melted, and the mixture is smooth.

Step 7

Set the chocolate mixture aside to cool for about 30 minutes. It should be cooled, but not hardened.

Step 8

After that, in a separate large bowl, using an electric mixer, whip the butter, powdered sugar, cocoa powder, and vanilla extract. Then beat in the cooled chocolate mixture.

Step 9

Transfer about 1 cup of the frosting to a piping bag with an open star tip.

Step 10

Frost the cake with the remaining frosting until covered and smooth.

Step 11

Now in a blender or food processor, blend the cookies to a fine crumb. Take the blended cookie crumbs and coat the outside of the cake, using your hands to press the crumbs into the side of the cake.

Step 12

Pipe the additional frosting around the top edge of the cake. Use a fork to make squiggly lines across the top. Slice, serve, and enjoy this decadent treat!