01 - In a medium mixing bowl, whisk together cold milk and instant vanilla pudding mix for 2 minutes until well combined. Allow pudding to set for 5 minutes or until thickened.
02 - In a chilled mixing bowl, beat heavy whipping cream with powdered sugar and vanilla extract using an electric mixer or whisk until stiff peaks form. Set aside.
03 - Arrange half of the cake cubes evenly in the base of a large clear trifle bowl or glass serving dish.
04 - Spoon one-third of the prepared vanilla pudding over the cake, followed by one-third of the whipped cream.
05 - Scatter half of the strawberries and blueberries evenly on top of the cream layer.
06 - Repeat with remaining cake cubes, another third of the pudding and whipped cream, and all raspberries with additional berries. Finish with final layers of pudding and whipped cream.
07 - Decorate the top with extra fresh berries and optional white chocolate shavings.
08 - Refrigerate assembled trifle for at least 2 hours to allow flavors to meld prior to serving.