Step 1: Prepare the Crust

1. Preheat your oven to 325°F (160°C).
2. In a mixing bowl, combine the chocolate cookie crumbs and melted butter until evenly moistened.
3. Press the mixture firmly into the bottom of a 9-inch springform pan to form an even crust.
4. Bake for 8-10 minutes, then remove from the oven and let cool.

Step 2: Make the Cheesecake Filling

5. In a large bowl, beat the cream cheese with a mixer until smooth and creamy.
6. Add the granulated sugar and brown sugar, mixing until combined.
7. Beat in the eggs one at a time, followed by the sour cream, heavy cream, orange juice, orange zest, and vanilla extract.
8. Stir in the melted dark chocolate until the mixture is smooth and well-combined.

Step 3: Bake the Cheesecake

9. Pour the filling over the prepared crust and smooth the top with a spatula.
10. Place the springform pan in a large roasting pan and pour hot water into the roasting pan, creating a water bath that reaches halfway up the sides of the springform pan.
11. Bake for 55-65 minutes, or until the edges are set but the center is slightly jiggly.
12. Turn off the oven and let the cheesecake cool inside with the door slightly open for 1 hour.
13. Remove from the oven, cool to room temperature, and then refrigerate for at least 4 hours or overnight.

Step 4: Make the Ganache Topping

14. Heat the heavy cream in a small saucepan over medium heat until it begins to simmer.
15. Remove from heat and pour over the chocolate chips in a bowl. Let sit for 2-3 minutes, then stir until smooth.
16. Pour the ganache over the chilled cheesecake, spreading it evenly.

Step 5: Garnish and Serve

17. Sprinkle orange zest over the ganache for a decorative touch, if desired.
18. Chill for 20-30 minutes to set the ganache before slicing and serving.