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

Roll out the puff pastry until it’s smooth and about 1/8 inch thick, then slice into rectangles.

In a mixing bowl, combine beaten eggs, cheese, crumbled bacon, caramelized onions, and seasonings.

Spoon the filling onto one half of each pastry rectangle, leaving a half-inch border.

Fold the other half of the pastry over the filling, crimp the edges with a fork.

Brush the tops with beaten egg or milk, then bake for 18-22 minutes until golden brown.

Cool on a wire rack for a few minutes before serving.