01 - In a medium mixing bowl, vigorously whisk cold milk with the instant vanilla pudding mix for 2 minutes until combined. Set aside for 5 minutes to thicken.
02 - In a chilled bowl, use an electric mixer or large whisk to beat heavy cream with powdered sugar and vanilla extract until stiff peaks hold. Reserve.
03 - Place half of the pound cake cubes in the base of a large clear trifle or glass serving bowl.
04 - Spread one-third of the vanilla pudding evenly over cake cubes, followed by one-third of the whipped cream.
05 - Arranged half of the strawberries and blueberries evenly atop the cream layer.
06 - Top with the remaining cake cubes, another third of the pudding and cream, then add the raspberries and remaining berries.
07 - Spread the final layer of pudding and whipped cream on top, smoothing evenly.
08 - Decorate with extra fresh berries and optional white chocolate shavings. Refrigerate trifle for at least 2 hours before serving.