HEAT dressing in large deep nonstick skillet on medium heat. Add chicken; sprinkle with oregano. Cook 5 min., stirring once.
ADD vegetables and broth; simmer 5 min. Stir in rice; cover. Simmer 5 min. Turn off heat. Let stand, covered, 5 min. or until liquid is absorbed.
GRATE 1 tsp. lemon peel; sprinkle over chicken. Cut lemon into 4 wedges; serve with chicken and rice mixture.