Steak and Potato Stir-Fry

1 lb. boneless beef sirloin steak, cut into thin strips
1 Tbsp. oil
2 cups cubed potatoes
2 cups sliced carrots
1/2 cup water
2 cups each: sliced mushrooms and onions
1/4 cup KRAFT Special Collection Balsamic Vinaigrette Dressing

COOK and stir meat in oil in skillet on high heat 2 min. or until browned. Remove from skillet; set aside.
ADD potatoes, carrots and water to skillet. Bring to boil; cover. Reduce heat to low; simmer 20 min. or until vegetables are tender.
STIR in mushrooms, onions, dressing and meat; cook and stir on high heat 5 min. or until heated through.