On parchment paper, roll thawed puff pastry to about 1/8-inch thickness. Cut 4 circles large enough to fit custard cups & have extra on top to gather & tie. Using the custard cup only as a form, place a circle of pastry in each. Line the pastry with thin sliced chicken breast, then sprinkle some walnuts & cheese in the bottom. Add some pear pieces, cheese, more walnuts. Top with another piece of chicken, cut to fit. Bring sides of pastry together in the center on top, pinch then tie with a chive green if you wish.