preheat your oven to 350 degrees°F.
Make your cake mix without following instructions in the back of the box, instead replace water with milk, oil with melted butter, and add one extra egg.
Bake at 350 degrees°F for 30-35 minutes or until the toothpick inserted comes out clean.
Let the cake cool down for 20 minutes, and then poke the cake with a metal straw.
Pour one cup of cold milk on the cake.
Spread chocolate whipped cream on the cake and decorate as desired.