Preheat oven to 375° F. Place the thawed puff pastry on a baking sheet lined with silicon mat or parchment paper. Score lines about 1″ from the edges of the pastry with a back of your knife. DO NOT cut through. Just score it deep.
Brush the border with the egg and sprinkle with the granulated sugar. Bake until golden and puffed, 18 to 22 minutes.
Brush the edges with egg wash and sprinkle with sugar. This will make very crisp and sweet tart crust.
Put them in a preheated 375 degree oven and bake for 20-22 minutes or until golden and puffed!
While hot, score the line near the edge again. Press the center part of the pastry gently. They will collapse like this. It’s kind of fun to see it happens. You need to let this cool, about 15-20 minutes.
For the cream filling; combine cream cheese, heavy cream, powdered sugar and the lemon zest. Whip until nice and fluffy. Spread the filling evenly over the sunken part of the cooled pastry. Scatter the blueberries over the filling and sprinkle with powdered sugar.