Start by making the chocolate pudding. Follow the package directions in the box, substituting the milk for heavy cream and add 1 tablespoon of vanilla extract. Place in a medium bowl in the fridge while making the rest of the ingredients.
Cut the chocolate cake in cake cubes and set aside.
Over a large bowl with the whisk attachment of an electric mixer, whip in high speed the heavy cream and sugar until stiff peaks form. Set aside
Start layering your dessert in a trifle bowl or trifle dish.
I did cake, pudding, raspberries, whipped cream, pudding, cake, whipped cream and raspberries. In the end you should have 2 layers of the pudding chocolate mixture, 2 layers of chocolate cake, 2 of whipped cream and 2 of fresh raspberries..