Preheat your oven to 400°F (200°C).
Roll out the puff pastry on a lightly floured surface.
Cut the pastry into squares, approximately 3x3 inches each.
Place a small piece of brie in the center of each square.
Top each piece of brie with a spoonful of cranberry sauce.
Fold the corners of the pastry over the filling to create a pocket.
Brush each assembled bite with the beaten egg.
Place the bites on a parchment-lined baking sheet and bake for 15-20 minutes.
Remove from the oven and let cool slightly before serving.
