Preheat grill to medium-high or oven to 450 degrees F.
Center one chicken breast half on each sheet of Reynolds Wrap(R) Non-Stick Foil with non-stick (dull) side toward food. Sprinkle with Italian seasoning. Arrange tortellini around chicken. Spoon tomatoes and olives over tortellini.
Bring up foil sides. Double fold top and ends to seal packet, leaving room for heat circulation inside. Repeat to make two packets.