In a mixing bowl, combine the ricotta cheese, mascarpone cheese, powdered sugar, vanilla extract, and cinnamon. Mix until smooth and well blended.
Gently fold in the mini chocolate chips until evenly distributed throughout the mixture.
Spoon the cannoli filling into each mini phyllo pastry cup, filling them generously.
If desired, sprinkle chopped pistachios or additional chocolate chips on top for garnish.
Refrigerate the filled cannoli cups for at least 30 minutes to allow the flavors to meld and the filling to firm up.
Serve chilled and enjoy your delightful mini cannoli cups!