01 - In a medium mixing bowl, whisk cold milk with instant vanilla pudding mix for 2 minutes until well combined. Allow to set for 5 minutes until thickened.
02 - In a chilled mixing 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 in the bottom of a large clear trifle or glass serving bowl.
04 - Spread one-third of the vanilla pudding over the cake layer, followed by one-third of the whipped cream.
05 - Scatter half of the strawberries and half of the blueberries evenly over the whipped cream layer.
06 - Add remaining cake cubes, another third of the pudding, another third of the whipped cream, and then arrange all remaining raspberries with the rest of the blueberries and strawberries.
07 - Top with the final portion of pudding and whipped cream, smoothing the surface evenly.
08 - Decorate with extra fresh berries and optional white chocolate shavings. Refrigerate for at least 2 hours to meld flavors before serving.