4 ounces thinly sliced deli ham, cut into small pieces
4 ounces Gruyère cheese, shredded
2 tablespoons Dijon mustard
1 tablespoon unsalted butter, melted
1 large egg, beaten (for egg wash)
1 teaspoon water
Instructions
Preheat your oven to 400°F (200°C). Line two baking sheets with parchment paper.
Unfold the thawed puff pastry sheet onto a lightly floured surface. Cut the pastry sheet into 9 equal squares.
In a small bowl, mix the shredded Gruyère cheese and the cut ham pieces together.
Place about 1 tablespoon of the ham and cheese mixture onto the center of 5 of the pastry squares.
Brush the edges of these 5 squares lightly with the beaten egg wash.
Place the remaining 4 pastry squares directly on top of the 5 filled squares, creating 4 stacks. Gently press the edges together to seal the filling inside.
Brush the tops of all 4 stacks with the remaining egg wash. Using a sharp knife, score a small ‘X’ pattern on the top of each stack without cutting all the way through.
Bake for 15 to 18 minutes, or until the puff pastry is golden brown and puffed.
While the stacks bake, prepare the glaze: Whisk together the Dijon mustard and melted butter in a small bowl.
Remove the stacks from the oven and immediately brush the tops with the Dijon glaze.
Let the ham and cheese puff pastry stacks cool slightly on the baking sheet before serving.
Notes
For extra flavor, you can sprinkle a pinch of black pepper over the ham and cheese mixture before sealing the stacks.
If you do not have Gruyère, Swiss cheese or sharp white cheddar work as good substitutes for these buttery pastry bites.
These make-ahead appetizers can be assembled up to 4 hours in advance; keep them covered in the refrigerator and add 5 minutes to the baking time if baking directly from cold.