Preheat your oven to 400°F (200°C).
Roll out the puff pastry on a lightly floured surface.
Cut the rolled pastry into squares.
Prepare the filling by mixing cream cheese, powdered sugar, vanilla extract, and lemon zest in a bowl.
Place a spoonful of the filling in the center of each pastry square.
Top the filling with sliced strawberries.
Fold the corners of each pastry toward the center and pinch to seal.
Brush the tops with beaten egg.
Bake for 20-25 minutes, until golden brown.
Remove from the oven and let cool slightly before serving.