Step 1: Prepare the Chocolate Cookie Crust

1. Preheat your oven to 325°F (163°C). Grease a 9-inch springform pan and line the bottom with parchment paper.
2. In a bowl, mix the crushed chocolate cookies and melted butter until well combined.
3. Press the mixture firmly into the bottom of the springform pan, using the back of a spoon or a flat measuring cup.
4. Bake the crust for 10 minutes, then remove from the oven and let it cool while you prepare the filling.

Step 2: Make the Coffee Cheesecake Filling

1. In a large mixing bowl, beat the cream cheese, sugar, and cornstarch until smooth and creamy (about 2 minutes).
2. Add the eggs one at a time, mixing on low speed after each addition to avoid incorporating too much air.
3. In a separate small bowl, whisk together the heavy cream, sour cream, espresso powder, and vanilla extract until smooth.
4. Gradually mix the coffee-cream mixture into the cheesecake batter, ensuring everything is well combined but not over-mixed.

Step 3: Bake the Cheesecake

1. Pour the batter over the cooled crust, smoothing the top with a spatula.
2. Water Bath Method (Recommended for a Crack-Free Cheesecake):
   • Wrap the outside of the springform pan with two layers of aluminum foil to prevent leaks.
   • Place the pan inside a larger baking dish and fill it with 1 inch of hot water to create a gentle, even bake.
3. Bake at 325°F (163°C) for 50-55 minutes or until the edges are set but the center still has a slight jiggle.
4. Turn off the oven and leave the cheesecake inside with the door slightly open for 1 hour to cool gradually.

Step 4: Chill the Cheesecake

1. Remove from the oven and let the cheesecake cool at room temperature for 30 minutes.
2. Transfer to the refrigerator and chill for at least 6 hours or overnight for the best texture and flavor.

Step 5: Make the Coffee Whipped Cream (Optional)

1. In a mixing bowl, beat heavy whipping cream, powdered sugar, and espresso powder until stiff peaks form.
2. Pipe or spread the whipped cream over the chilled cheesecake before serving.

Step 6: Garnish and Serve

1. Dust the cheesecake with cocoa powder, sprinkle with chocolate shavings, or decorate with whole coffee beans.
2. Slice and serve with a hot cup of coffee or espresso for the ultimate coffee-lover’s dessert!