1. Preheat the Oven:

• Preheat your oven to 325°F (160°C). Grease a 9-inch springform pan and line the bottom with parchment paper.

2. Make the Crust:

• Crush the Oreos into fine crumbs using a food processor or by placing them in a sealed bag and smashing with a rolling pin.
• Combine the crumbs with melted butter and press the mixture evenly into the bottom of the springform pan. Refrigerate while preparing the filling.

3. Prepare the Cheesecake Filling:

• In a large mixing bowl, beat the cream cheese until smooth and creamy.
• Add the granulated sugar and cocoa powder, mixing until fully incorporated.
• Beat in the eggs one at a time, mixing well after each addition.
• Add the sour cream, heavy cream, vanilla extract, vinegar, and blue food coloring. Mix until smooth and the desired blue color is achieved.

4. Assemble and Bake:

• Pour the cheesecake filling over the prepared crust. Smooth the top with a spatula.
• Wrap the outside of the pan in aluminum foil and place it in a large roasting pan. Add hot water to the roasting pan until it reaches halfway up the sides of the springform pan (this creates a water bath).
• Bake for 60-70 minutes, or until the center is slightly jiggly but the edges are set.

5. Cool and Chill:

• Remove the cheesecake from the water bath and let it cool to room temperature. Refrigerate for at least 6 hours or overnight for best results.

6. Make the Topping:

• Whip the heavy cream and powdered sugar together until stiff peaks form. Spread or pipe the whipped cream over the chilled cheesecake. Sprinkle with crushed Oreos for garnish.

7. Serve:

• Carefully remove the springform pan and transfer the cheesecake to a serving plate. Slice and serve chilled.