1. In a bowl, place together, mascarpone cheese, superfine sugar and Frangelico liqueur.
2. Using a hand blender, blend until the mixture is well blended for about 2 minutes.
3. In a zip lock bag, transfer the cheese mixture, push the mixture in corner of the bag.
4. Using kitchen scissor, snip of the corner of the bag, and press the bag to fill the cheese mixture into the cannoli.
5. Dust powder sugar on top if desired and serve.