01 - Preheat the oven to 325°F. Grease a 9-inch springform pan and line the base with parchment paper.
02 - Combine the crushed chocolate sandwich cookies with melted butter until evenly moistened. Press the mixture firmly into the bottom of the prepared pan to form an even layer. Bake for 10 minutes, then set aside to cool slightly.
03 - Using an electric mixer, beat the softened cream cheese and granulated sugar together on medium speed until completely smooth and free of lumps.
04 - Add the creamy peanut butter and sour cream to the cream cheese mixture. Blend until fully combined and silky in texture.
05 - Add the eggs one at a time, mixing on low speed just until each is incorporated. Stir in the vanilla extract. Avoid overmixing to prevent air bubbles.
06 - Pour half of the cheesecake batter over the baked crust. Drizzle half of the melted dark chocolate over the surface and gently swirl with a butter knife. Pour the remaining batter on top and repeat with the remaining melted chocolate, creating decorative swirls.
07 - Bake for 50 to 55 minutes, until the edges are set and the center still has a slight jiggle. Turn off the oven, crack the door open, and let the cheesecake rest inside for 1 hour to prevent cracking.
08 - Remove the cheesecake from the oven and transfer to the refrigerator. Chill for at least 4 hours or preferably overnight to fully set.
09 - Heat the heavy cream in a small saucepan until hot but not boiling. Pour over the chopped dark chocolate and let stand for 2 minutes. Stir until glossy and smooth, then blend in the peanut butter. Spread the ganache evenly over the chilled cheesecake and allow it to set for at least 30 minutes before slicing.