Ham and Cheese Turnovers

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Ingredients

1. 1/2 pound frozen all-butter puff pastry, thawed
2. 4 thin slices of smoked ham, such as Black Forest (4 ounces)
3. 1 cup Gruyère cheese, shredded (3 ounces)
4. 1 large egg, lightly beaten

1. Preheat the oven to 400°. Line a rimmed baking sheet with parchment paper. On a lightly floured work surface, gently roll out the puff pastry to a roughly 13-inch square 1/16 inch thick. Cut out four 6-inch squares and transfer them to the prepared baking sheet. Refrigerate the pastry for 5 minutes.
2. Meanwhile, lay the ham slices on a work surface. Spoon 1/4 cup of the shredded Gruyère on one side of each slice of ham, then fold the other side of the ham over the cheese to form a neat package.
3. Lightly brush the edges of the pastry squares with water. Set the ham-and-cheese packages on the squares and fold the pastry corner to corner to form triangles. Press the edges of the turnovers together and crimp decoratively with a fork. Brush the turnovers with the beaten egg and bake them for about 30 minutes, or until golden brown and puffed. Let cool slightly and serve.