In a mixing bowl, combine the mascarpone cheese, powdered sugar, and vanilla extract. Mix until smooth and creamy.
In a separate bowl, whip the cream until soft peaks form. Gently fold the whipped cream into the mascarpone mixture until well combined.
If desired, lightly soak the crumbled chocolate cake with cherry juice to enhance flavor.
Begin layering the trifle by placing a generous layer of crumbled chocolate cake at the bottom of a large glass trifle dish or individual serving glasses.
Add a layer of the mascarpone and whipped cream mixture on top of the cake.
Next, add a layer of the halved cherries.
Repeat the layering process (cake, cream, cherries) until you reach the top of the dish, finishing with a layer of the cream.
Garnish the top with chocolate shavings or chips and a few whole cherries for an elegant touch.
Chill the trifle in the refrigerator for at least 2 hours to allow the flavors to meld together.