01 - Combine the crushed cookies with the melted butter in a bowl. Press the mixture firmly and evenly into the bottom of a 9x13 inch dish. Refrigerate while preparing the next layer.
02 - Add the blueberries, granulated sugar, lemon juice, and water to a saucepan. Cook over medium heat until the berries begin to burst. Whisk the cornstarch with a small splash of water to form a slurry, then stir it into the berry mixture. Simmer until the sauce thickens, about 2 minutes. Remove from heat and let cool completely.
03 - Beat the cream cheese with the powdered sugar in a large bowl until completely smooth. Incorporate the lemon zest and lemon juice, mixing until evenly combined. In a separate bowl, whip the cold heavy cream to stiff peaks. Gently fold the whipped cream into the lemon mixture until just blended.
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 and refrigerate for at least 4 hours, or overnight for the cleanest slices and best flavor development.
06 - Spread the whipped cream over the top layer before serving. Finish with a scattering of fresh blueberries and a dusting of lemon zest.