01 - Combine crushed cookies and melted butter in a bowl, mixing until evenly moistened. Press the mixture firmly into the bottom of a 9x13 inch dish. Refrigerate while preparing the next layer.
02 - Combine blueberries, sugar, lemon juice, and water in a medium saucepan. Cook over medium heat until berries burst and release their juice. Dissolve cornstarch in a 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 with powdered sugar in a large bowl until completely smooth. Add lemon zest and 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 the cooled blueberry sauce over the cream layer and spread gently. Repeat with the remaining lemon cream, then the remaining blueberry sauce.
05 - Cover the dish tightly 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 before serving. Finish with a scattering of fresh blueberries and a dusting of lemon zest.