Bake cake as directed on the package in a 13 x 9-inch pan.
Cool and pierce all over with a fork.
Cook and cool vanilla pudding.
Whip heavy cream, sweetening to taste with confectioners' sugar.
In a large glass bowl, put in a layer of chocolate cake that
has been cut into small squares. Pour some vanilla pudding over
cake layer. Spread with a layer of whipped cream. Sprinkle with
crushed candy canes.
Continue to add layers until the bowl is
filled, ending with the whipped cream layer.