Bake cake according to directions, and let cool.

Poke holes in cake about 1/2 inch from each other.

Mix together pudding mix, milk, and vanilla. Before it sets, pour over cake and into holes. Chill in fridge for 1 hour.

Add sugar, milk, and cocoa powder to a medium size pot. Stir together on low heat and let bubble a couple minutes.

Add in butter, chocolate chips, and vanilla. Remove from heat and stir until smooth.

Once slightly cooled, pour over the pudding layer.

Chill for at least 4 hours before serving