Heat 1-1/2 tsp. oil in large skillet. Add meat; cook 3 to 4 min. on medium-high heat or until evenly browned. Remove from skillet; cover to keep warm. Heat remaining oil in skillet. Add mushrooms, onions and carrots; cook 10 min. or until carrots are crisp-tender, stirring occasionally. Add gravy and barbecue sauce to skillet; stir. Bring to boil. Meanwhile, mix corn starch and water.