COOK and stir meat in hot oil in large 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. Simmer on low heat 15 min.
STIR in meat, mushrooms, onions and dressing; cook and stir on high heat 5 min. or until heated through.