Start making the crust by combining the ginger snap crumbs, butter and sugar in a small mixing bowl. Next, press the mixture into a tart pan.
Place the crust in the refrigerator to chill while making the tart filling.
Use a stand mixer or electric hand mixer to combine the mascarpone cheese, ricotta cheese, and sour cream.
Add the brown sugar, coffee syrup and marsala wine.
Use the mixer to combine all of the ingredients for 2-3 minutes, or until the filling is smooth and creamy, then spoon it into the prepared crust.
Dust the cocoa powder on top using a sifter. Use a vegetable peeler to shave the chocolate on top of the tart before serving.
Notes
For the coffee syrup, I used Torani coffee Syrup which can be purchased at places like World Market or Smart and Final. If you prefer not to use the syrup, you can replace it with 2 shots of espresso.