Preheat the oven to 400°F. Line a baking sheet with parchment paper.
In a medium bowl, combine the softened cream cheese, powdered sugar, and vanilla extract. Mix until smooth and creamy.
On a lightly floured surface, roll out each sheet of puff pastry to smooth out creases. Cut each sheet into 4 equal squares.
Place a spoonful of the cream cheese mixture in the center of each pastry square. Top with a few slices of fresh strawberries.
Fold the corners of each pastry square toward the center, pinching to seal. Brush the tops with the beaten egg and sprinkle with granulated sugar.
Bake in the preheated oven for 15-20 minutes, or until the pastries are golden brown and puffed.
Allow to cool slightly before serving. Enjoy warm or at room temperature.