Creating Blueberry Cream Cheese Puff Pastry involves a few straightforward steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).

2. Prepare Pastry: On a lightly floured surface, roll out the puff pastry sheets slightly to smooth them.

3. Cut Squares: Cut the puff pastry into squares (approximately 4×4 inches).

4. Make Filling: In a mixing bowl, combine the softened cream cheese, granulated sugar, and vanilla extract until smooth and creamy.

5. Add Blueberries: Gently fold the fresh blueberries into the cream cheese mixture.

6. Assemble Pastries: Place a spoonful of the cream cheese mixture into the center of each pastry square. Be careful not to overfill.

7. Fold the Pastry: Fold the corners of the pastry over the filling, pinching the edges to seal. If desired, you can crimp the edges with a fork for extra flair.

8. Prepare Egg Wash: In a small bowl, beat the egg and brush the mixture over the tops of the pastries for a golden finish.

9. Bake: Place the pastries on a baking sheet lined with parchment paper and bake for 20-25 minutes, or until golden brown.

10. Cool: Remove from the oven and let them cool slightly on a wire rack. Dust with powdered sugar before serving, if desired.

Following these steps ensures that you’ll create a stunning treat that’s both tasty and pleasing to the eye.