Ham And Cheese Pockets
["1 (17 1/4 oz.) pkg. frozen puff pastry, thawed about 20 minutes at room temperature", "Dijon-style mustard", "6 oz. sliced Swiss cheese, cut into 3 1/2 x 2-inch strips", "6 oz. sliced baked or boiled ham, cut into 3 1/2 x 2-inch strips", "1 egg, beaten"]
["Roll each sheet of puff pastry out to a 12-inch square on a lightly floured board or pastry cloth.", "Cut into nine 4-inch squares.", "Repeat with remaining sheet of pastry."]
["frozen puff pastry", "mustard", "Swiss cheese", "ham", "egg"]