Preheat your oven to 400°F (200°C) and prepare a baking sheet lined with parchment paper.

In a mixing bowl, combine softened cream cheese, granulated sugar, and vanilla extract until blended; gently fold in fresh blueberries.

Roll out thawed puff pastry sheets to 1/8-inch thickness and cut into 4-inch squares.

Place a spoonful of filling in the center of each square and fold them into triangles or rectangles, sealing the edges.

Bake the pastries for 15 to 20 minutes until golden brown and puffed up.

Let them cool on the baking sheet for a few minutes before serving, optionally dusting with powdered sugar.