01 - Preheat oven to 325°F. Line the bottom of a 9-inch springform pan with parchment paper and grease the sides lightly.
02 - Process chocolate sandwich cookies in a food processor until fine crumbs form. Combine with melted butter and mix until evenly moistened. Press firmly into the bottom of the prepared pan. Bake for 10 minutes, then set aside to cool slightly.
03 - Beat cream cheese and granulated sugar in a large bowl until completely smooth and creamy, about 2-3 minutes. Add eggs one at a time, mixing well after each addition and scraping down the sides as needed.
04 - Blend in sour cream and vanilla extract until fully incorporated. Whisk strawberry puree with cornstarch until smooth, then gently fold into the cheesecake batter until just combined.
05 - Pour filling over the cooled crust and smooth the top with an offset spatula. Bake for 50-60 minutes until the edges are set but the center still has a slight wobble. Turn off the oven, crack the door open slightly, and let cool inside for 1 hour.
06 - Remove from oven and run a thin knife around the edge to loosen the cake from the pan. Cool completely to room temperature, then refrigerate for at least 4 hours or overnight until fully set.
07 - Heat heavy cream in a small saucepan until just simmering. Pour over chopped chocolate in a heatproof bowl and let sit for 2 minutes. Stir gently until smooth and glossy. Cool for 10-15 minutes until slightly thickened but still spreadable.
08 - Spread ganache evenly over the chilled cheesecake. Arrange fresh strawberry halves on top in a decorative pattern. Drizzle with melted dark chocolate if desired. Refrigerate for 30 minutes to set the ganache before slicing and serving.