Tasty puff pastry with ham and cheese and bechamel sauce

Dietary information:
Vegetarian option: Replace the ham with sautéed mushrooms or spinach.
Gluten-free option: Use gluten-free puff pastry and a gluten-free flour substitute for the béchamel.
Low-carb option: Serve without the puff pastry and enjoy the ham, cheese, and béchamel as a delicious topping for roasted vegetables.