Follow these simple steps to create your Reeses Peanut Butter Cheesecake:

1. Preheat the Oven: Preheat your oven to 325°F (163°C).
2. Prepare the Crust: In a mixing bowl, combine graham cracker crumbs, cocoa powder, granulated sugar, and melted butter. Mix until well combined.
3. Press the Crust: Press the mixture into the bottom and sides of a 9-inch springform pan. Use your hands or the bottom of a measuring cup to ensure it’s packed tightly.
4. Bake the Crust: Place the pan in the oven and bake for 10 minutes. Remove from the oven and allow it to cool.
5. Mix the Filling: In a large bowl, beat the cream cheese until smooth. Add the peanut butter and beat until combined.
6. Add Sugar and Eggs: Gradually mix in the powdered sugar, then add the eggs one at a time. Mix well until fully incorporated. Add vanilla extract and sour cream; blend until smooth.
7. Pour Filling into Crust: Pour the cheesecake filling into the cooled crust. Smooth the top with a spatula.
8. Bake the Cheesecake: Bake the cheesecake in the preheated oven for 60 minutes, or until the center is set but slightly jiggly.
9. Cool the Cheesecake: Turn off the oven, crack the door slightly, and let the cheesecake cool in the oven for 1 hour. Remove from the oven and cool completely at room temperature.
10. Chill in the Refrigerator: Cover and refrigerate the cheesecake for at least 4 hours or overnight for best results.
11. Prepare the Ganache: In a small saucepan, heat the heavy cream over medium heat until it begins to simmer. Remove from heat and stir in the chocolate chips until melted and smooth.
12. Top the Cheesecake: Pour the ganache over the chilled cheesecake, spreading it evenly. Let it set for about 30 minutes.
13. Garnish: Sprinkle crushed Reeses Peanut Butter Cups on top and add whipped cream if desired.

These steps will easily guide you through the process of creating your indulgent Reeses Peanut Butter Cheesecake.