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

In a bowl, mix cream cheese, cheddar cheese, jalapeños, garlic powder, salt, and pepper until smooth.

Roll out the puff pastry on a floured surface and cut it into squares (approximately 4×4 inches).

Place about one tablespoon of filling in the center of each square. Fold over corners to seal tightly.

Brush with egg wash and bake for 15-20 minutes until golden brown. Let cool slightly before serving.