Prepare the Ricotta. Drain the ricotta overnight if possible (or at least for a few hours) to remove excess moisture. Wrap it in cheesecloth or paper towels and place it in a colander over a bowl.
Make the Filling. In a large bowl, beat the drained ricotta and mascarpone until smooth and fluffy. Add powdered sugar, vanilla, orange zest, and cinnamon. Fold in the mini chocolate chips.
Assemble the Pie. Spread the creamy filling into your graham cracker crust and smooth the top with a spatula.
Chill. Cover and refrigerate the pie for at least 4 hours, or overnight. The longer it chills, the better it sets.
Garnish and Serve. Right before serving, top with whipped cream, a dusting of powdered sugar, and extra chocolate chips if desired.