TOSS meat with 1/4 cup dressing in shallow dish. Refrigerate 1 hour to marinate, stirring occasionally. Remove meat from marinade; discard marinade.
COOK meat in remaining dressing in large skillet on medium-high heat 5 to 6 min. or until done. Transfer meat to bowl; cover to keep warm.
ADD vegetables to skillet; cook and stir 3 to 5 min. or until crisp-tender. Add meat; cook 1 to 2 min. or until heated through, stirring frequently. Spoon onto tortillas; top with remaining ingredients. Roll up.
serving size = 2 fajitas (146 g)