Heat oven to 350°F. Line a baking sheet with parchment.
Arrange mini phyllo shells on the sheet and bake 5–7 minutes to crisp. Cool completely.
Blot ricotta dry with paper towels to remove excess moisture.
Beat mascarpone, powdered sugar, vanilla, cinnamon, and salt until smooth and fluffy.
Mix in ricotta, then add heavy cream a little at a time until pipeable.
Fold in orange zest and half of the mini chocolate chips. Chill filling 15–20 minutes.
Melt dark chocolate until smooth, stirring often. Transfer to a small piping bag or spoon.
Pipe or spoon the chilled filling into the cooled phyllo shells.
Drizzle with melted chocolate. Sprinkle pistachios and remaining chips. Dust with powdered sugar if desired.