Preheat your oven to 350°F. Place the mini phyllo pastry shells on a baking sheet and bake for 5-7 minutes until they are lightly golden and crispy. Allow them to cool completely.
In a medium mixing bowl, combine the drained ricotta cheese, mascarpone cheese, powdered sugar, vanilla extract, and cinnamon. Mix until smooth and creamy.
Gently fold in the mini chocolate chips until evenly distributed.
Using a piping bag or a small spoon, fill each cooled phyllo shell with the cannoli filling.
If desired, sprinkle chopped pistachios or additional chocolate chips on top for garnish.
Serve immediately or refrigerate for up to 2 hours before serving for a chilled treat.