Use your favorite chocolate cake recipe or even a box of your favorite chocolate cake mix. Allow cake to cool for 15 minutes before proceeding. Break up the cake into small pieces in a large bowl.
2 packages instant chocolate pudding mix
3 cups whole milk
2 cups heavy cream
1 1/2 tablespoons sugar
2 teaspoons vanilla extract
About 1 cup chocolate wafer crumbs, or chocolate-sandwich cookies, crushed into crumbs