Prepare Ingredients - Gather the puff pastry, cream cheese, fresh herbs, Gruyere cheese, and egg wash. Allow the puff pastry to thaw if frozen. - Ensure that the cream cheese is softened to room temperature for easy mixing.

Preheat Oven and Prepare Baking Sheet - Preheat the oven to 375°F (190°C) and line a baking sheet with parchment paper. - Using a properly preheated oven ensures even baking of the galette.

Mix Filling Ingredients - In a mixing bowl, combine the softened cream cheese, chopped fresh herbs, and shredded Gruyere cheese until well mixed.

Roll Out Puff Pastry - On a lightly floured surface, roll out the puff pastry sheet into a circle or rectangle, about 1/8 inch thick.

Assemble the Galette - Spread the cheese and herb filling evenly over the puff pastry, leaving a border around the edges. Fold the edges of the pastry over the filling.

Brush with Egg Wash and Bake - Brush the exposed pastry with the egg wash. Transfer the galette to the prepared baking sheet and bake for 25-30 minutes, or until the pastry is golden brown and the filling is bubbly.

Cool and Serve - Allow the galette to cool slightly before slicing and serving. Enjoy warm as an appetizer or side dish.