you may also substitute 1/2 cup kraft zesty italian dressing mixed with 2 tsp. dried oregano leaves Greek salad dressing
MIX dressing and mayo; pour into large resealable plastic bag. Add chicken; seal bag. Turn bag over several times to evenly coat chicken with dressing mixture. Refrigerate 20 minute or up to 2 hours to marinate.
HEAT grill to medium-high heat. Remove chicken from marinade; discard bag and marinade. Thread chicken and onions alternately onto skewers.
GRILL 8 to 10 minute or until chicken is done, turning occasionally. Meanwhile, place lemon, cut-sides down, on grill grate next to kabobs. Squeeze lemon juice over kabobs just before serving.