In a large mixing bowl, whip the heavy cream until soft peaks form. Gradually add the powdered sugar and vanilla extract, continuing to whip until stiff peaks form. Set aside.
Cut the angel food cake into 1-inch cubes.
In a trifle dish or a large glass bowl, layer half of the angel food cake cubes at the bottom.
Spoon half of the vanilla pudding over the cake cubes, followed by half of the whipped cream.
Add half of the mixed berries on top of the whipped cream.
Repeat the layers with the remaining cake cubes, pudding, whipped cream, and berries.
Garnish with fresh mint leaves if desired.
Chill the trifle in the refrigerator for at least 1 hour before serving to allow the flavors to meld.