Mix feta, lemon peel and oregano. Place 1 chicken breast, 3 tomato slices, 1/4 cup onion and 5 olives on the center of each sheet. Spoon 1/4 of the cheese mixture over chicken and vegetables on each sheet. Seal in a tent pack. Place packets on grill over medium heat. Cover grill; cook 20 to 25 minutes, rotating packets 1/2 turn after 10 minutes, until chicken is cooked through. Serve with your camping buddies and enjoy!
