01 - In a medium mixing bowl, whisk together cold milk and instant vanilla pudding mix for 2 minutes until smooth. Allow to stand for 5 minutes, or until the mixture thickens.
02 - In a separate chilled bowl, beat heavy cream with powdered sugar and vanilla extract using an electric mixer or whisk until stiff peaks form. Set aside.
03 - Arrange half of the pound cake cubes evenly on the bottom of a large clear trifle bowl or glass serving dish.
04 - Spoon one-third of the vanilla pudding over the cake layer, followed by one-third of the whipped cream.
05 - Scatter half of the sliced strawberries and half of the blueberries evenly over the cream layer.
06 - Repeat the process with the remaining cake cubes, another third of the pudding, another third of the whipped cream, and top with the raspberries and remaining berries. Layer with the final third of pudding and cream.
07 - Decorate the top with extra fresh berries and optional white chocolate shavings.
08 - Cover and refrigerate for at least 2 hours to allow flavors to meld before serving.