Unfold: Gently unfold one sheet of puff pastry onto the floured surface. Let sit if stiff.
Roll: Gently roll the puff pastry sheet into a slightly larger rectangle, about 12×10 inches.
Mustard: Evenly spread the Dijon mustard over the entire surface, leaving a 1/2 inch border.
Ham: Arrange the thinly sliced ham evenly over the mustard-covered puff pastry.
Cheese: In a medium bowl, combine the shredded Gruyere and Swiss cheeses.
Sprinkle: Generously sprinkle the combined cheese mixture over the ham layer.
Season: Sprinkle the dried thyme, garlic powder, salt, and pepper evenly over the cheese layer.
Repeat: Repeat steps 2-8 with the second sheet of puff pastry.
Top: Carefully lift the second puff pastry sheet and place it on top of the first. Align the edges.
Seal: Gently press the edges of the two puff pastry sheets together to seal them. Crimp with a fork.
Cut: Cut the assembled puff pastry into your desired shapes (e.g., 2-inch squares).
Arrange: Line a baking sheet with parchment paper. Transfer the cut puff pastry pieces onto the prepared baking sheet, leaving space between each piece.
Egg Wash: In a small bowl, whisk together the beaten egg and milk or cream.
Brush: Gently brush the tops of the puff pastry pieces with the egg wash.
Optional Topping: Sprinkle with everything bagel seasoning, if desired.
Bake: Preheat oven to 400°F (200°C). Bake for 15-20 minutes, or until golden brown and puffed up.
Cool: Let the puff pastry cool slightly on the baking sheet before serving.
Notes
Cheese Variations: Provolone, mozzarella, or cheddar can be substituted.
Ham Variations: Turkey, roast beef, or salami can be substituted.
Vegetarian Option: Omit ham and add sautéed vegetables.
Herb Variations: Experiment with rosemary, oregano, or basil.
Make Ahead: Assemble ahead and refrigerate, covered tightly.
Freezing: Baked pastries can be frozen. Cool, wrap individually, and freeze. Reheat at 350°F (175°C).
Serving Suggestions: Serve as an appetizer, snack, or light meal.
Dipping Sauces: Serve with honey mustard, ranch dressing, or marinara sauce.