01 - Combine crushed cookies with melted butter in a bowl. Press the mixture firmly into the bottom of a 9x13 inch dish. Chill in the refrigerator while preparing the remaining layers.
02 - Combine blueberries, 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 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 lemon juice, mixing until well incorporated. In a separate bowl, whip the cold heavy cream to stiff peaks. Gently fold the whipped cream into the lemon mixture until just combined, being careful not to deflate the cream.
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 followed by 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. Garnish with fresh blueberries and a sprinkle of lemon zest.