1: In a bowl, combine mascarpone and powdered sugar, and mix with a spoon.
2: Add a generous amount of ground cinnamon and mix until the cream is uniform.
3: Place the cinnamon cream in a piping bag with a large plain tip and fill all the vol au vent.
4: Once all the vol au vent are filled with the cinnamon cream, sprinkle with more ground cinnamon and serve.
