Place chicken in medium bowl. Add soy sauce, ginger, sherry, sugar, vegetable oil, pepper and sesame oil; stir to combine. Marinate in refrigerator for 30 minutes.
Preheat oven to 350° F.
Cut sixteen 6-inch-square pieces of heavy-duty foil. Fold each square in half to form a rectangle. Make two 1/4-inch folds on each short side, leaving the long side open, forming a packet.
Place scant 1/4 cup chicken mixture in each foil packet Double fold the open edge to tightly seal. Place packets on rimmed baking sheet.
Bake for 20 to 25 minutes. Open one packet to test for doneness; chicken should no longer be pink.Servings: 16