01 - Preheat your oven to 325°F. Line the bottom of a 9-inch springform pan with parchment paper and set aside.
02 - Process chocolate sandwich cookies in a food processor until you achieve fine crumbs. Pour in melted butter and pulse until combined. Press the mixture firmly and evenly into the bottom of your prepared pan. Bake for 10 minutes, then allow to cool while preparing the filling.
03 - In a large mixing bowl, beat softened cream cheese and granulated sugar until completely smooth and creamy, about 2-3 minutes. Add eggs one at a time, mixing thoroughly after each addition. Blend in sour cream and vanilla extract until incorporated.
04 - Whisk cornstarch into the strawberry puree until smooth, then gently fold this mixture into the cheesecake batter until just combined. Be careful not to overmix.
05 - Pour the filling over the cooled crust, smoothing 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 allow the cheesecake to cool gradually inside for 1 hour.
06 - Remove from the oven and immediately run a thin knife around the perimeter to loosen from the pan sides. Let cool completely to room temperature, then refrigerate for at least 4 hours or overnight for optimal texture.
07 - Heat heavy cream in a small saucepan until it just begins to simmer. Pour over chopped semisweet chocolate in a heatproof bowl and let stand for 2 minutes. Stir steadily until completely smooth and glossy. Allow to cool until it reaches a spreadable consistency.
08 - Spread the cooled ganache evenly over the chilled cheesecake. Arrange fresh strawberry halves decoratively on top. If desired, drizzle with melted dark chocolate. Return to the refrigerator for 30 minutes to set before slicing and serving.