1. In a bowl, combine shredded chicken, cheddar cheese, cream cheese, garlic powder, salt, and black pepper. Mix until fully combined.

2. Lightly flour your surface and unfold the puff pastry sheets. Roll them out gently to smooth any creases.

3. Cut each sheet into squares or triangles, depending on the shape you prefer.

4. Spoon about a tablespoon of filling onto each piece of pastry.

5. Roll the dough over the filling, forming croissant-like shapes. Tuck in the sides slightly to prevent leakage.

6. Place the rolls on a baking sheet lined with parchment paper.

7. Brush the tops with the beaten egg for a glossy golden finish.

8. Bake at 400°F (200°C) for 18-22 minutes or until golden and puffed.

9. Let cool slightly and serve warm.