Preheat your oven to 400°F (200°C).
Cook the chopped bacon in a skillet over medium heat until crispy.
In a mixing bowl, combine the cooked bacon, shredded cheese, cream cheese, garlic powder, and black pepper.
Roll out the puff pastry sheet on a lightly floured surface and cut it into squares (approximately 4x4 inches each).
Place a spoonful of the cheese and bacon mixture in the center of each square.
Fold the pastry squares over to form triangles and seal the edges by pressing with a fork.
Brush the tops of the turnovers with the beaten egg to enhance browning.
Place the turnovers on a baking sheet lined with parchment paper and bake for 20-25 minutes or until golden brown.
Remove from the oven and let cool slightly before serving.