Preheat oven to 450°.
Tear off 4 (12- x 18-inch) foil sheets.
Stir together chicken and remaining ingredients. Place one-fourth of mixture in center of each foil sheet.
Bring up 2 sides of each foil sheet, and double fold with about 1-inch-wide folds. Double fold each end to form a packet, leaving room for heat circulation inside packet. Place on a baking sheet.
Bake at 450° for 20 to 22 minutes. Open foil packets carefully, allowing steam to escape.