Preheat your oven to 400°F (200°C). Allow 10-15 minutes for it to reach the desired temperature.

In a mixing bowl, combine softened cream cheese, shredded cheese, chopped fresh herbs, garlic powder, salt, and pepper. Mix until smooth.

On a lightly floured surface, roll out the chilled puff pastry sheet until about 1/8 inch thick and cut into 3-inch squares.

Place about a tablespoon of the cheese filling in the center of each pastry square. Avoid overfilling.

Fold the corners of the pastry squares towards the center to create triangles and seal edges with a fork.

Line a baking sheet with parchment paper and arrange the pastry bites in a single layer.

In a small bowl, beat the egg to make an egg wash and brush the tops of the pastry bites.

Bake in the preheated oven for 15-20 minutes, or until golden brown.

Remove from the oven and let cool slightly on a wire rack before serving.