1 box yellow cake mix, plus ingredients called for on package
2 (3.4 oz) boxes instant vanilla pudding
4 cups milk
1 teaspoon vanilla extract
12 oz bag chocolate chips
1 1/2 cups heavy cream
Prepare yellow cake in a 9×13-inch baking pan according to package instructions. Let cool completely.
Once cake has cooled, poke holes all over the cake using the end of a wooden spoon.
While cake cools, whisk together the instant pudding, milk, and vanilla extract in a large bowl. Before the pudding has a chance to set up and thicken, pour it evenly over the cake. Place in refrigerator to chill for one hour.
Once cake has chilled, make the chocolate ganache: