Preheat your oven according to the cake mix instructions.
Bake the chocolate cake according to the package directions and let it cool completely.
Once cooled, slice the cake horizontally into two layers.
In a bowl, whip the heavy cream with powdered sugar and vanilla extract until soft peaks form.
Place one layer of cake on a serving plate.
Spread a layer of softened ice cream over the first cake layer.
Add a layer of whipped cream on top of the ice cream.
Place the second layer of cake on top and repeat the ice cream and whipped cream layers.
Freeze the assembled cake for at least 4 hours or until firm.
Before serving, decorate with fresh fruits and chocolate shavings.