1. Preheat the oven to 325°F. Grease a 9-inch springform pan and wrap the outside with foil if using a water bath.

2. Mix the crushed chocolate sandwich cookies with melted butter until evenly combined. Press the mixture firmly into the bottom of the pan.

3. Bake the crust for 10 minutes, then remove it from the oven and let it cool slightly.

4. In a large bowl, beat the cream cheese until completely smooth.

5. Add the granulated sugar and mix until creamy.

6. Blend in the sour cream, Kahlua, and vanilla extract until the filling looks silky.

7. Add the eggs one at a time, mixing on low speed just until each egg disappears into the batter.

8. Pour the filling over the crust and smooth the top.

9. Bake for 55 to 65 minutes, until the edges are set and the center still has a slight wobble.

10. Turn off the oven, crack the oven door, and let the cheesecake rest inside for 1 hour.

11. Remove the cheesecake and chill it in the refrigerator for at least 6 hours, preferably overnight.

12. Heat the heavy cream until hot but not boiling, then pour it over the chocolate chips. Let it sit for 2 minutes and stir until smooth.

13. Spread the chocolate topping over the chilled cheesecake.

14. Return the cheesecake to the refrigerator for 20 to 30 minutes, then slice and serve.