01 - Combine crushed cookies and melted butter in a bowl until evenly moistened. Press the mixture firmly into the bottom of a 9x13 inch dish. Refrigerate while preparing the remaining layers.
02 - Combine blueberries, granulated sugar, lemon juice, and water in a medium saucepan. Cook over medium heat until the berries burst and release their juices. Whisk cornstarch with a small splash of water to form a slurry, then stir into the berry mixture. Simmer until thickened, about 2 minutes. Remove from heat and cool completely.
03 - Beat cream cheese and powdered sugar together in a large bowl until completely smooth. Add lemon zest and lemon juice, mixing until well incorporated. In a separate bowl, whip cold heavy cream to stiff peaks. Gently fold the whipped cream into the lemon mixture until just combined, taking care not to deflate the volume.
04 - Spread half of the lemon cream evenly over the chilled cookie crust. Spoon half of the cooled blueberry sauce over the cream layer and spread gently. Repeat with the remaining lemon cream, then finish with the remaining blueberry sauce.
05 - Cover the dish tightly with plastic wrap and refrigerate for at least 4 hours, or overnight for the cleanest slices and best flavor development.
06 - Spread whipped cream over the top layer just before serving. Garnish with fresh blueberries and a sprinkle of lemon zest. Slice into 12 portions and serve chilled.