HEAT 2 Tbsp. dressing in large skillet on medium-high heat. Add onions; cook 1 min. Stir in chicken; cook 2 min. or until chicken is done, stirring occasionally. Remove from skillet; cover to keep warm.

ADD remaining dressing, soy sauce and vegetables to skillet; stir. Cook 4 to 5 min. or until vegetables are crisp-tender, stirring frequently.

RETURN chicken to skillet; cook 2 min. or until heated through, stirring occasionally. Stir in nuts. Serve with rice.