PREHEAT broiler. Heat ovenproof skillet on medium heat. Add meat; cook 6 min. on each side or until browned on both sides but still pink in centres. Remove from skillet; cover to keep warm.

MELT butter in same skillet on medium-high heat. Add zucchini and onions; cook and stir 2 min. or until vegetables are tender. Remove from heat. Stir in dry stuffing mix and cheese until well blended. Remove from skillet. Add meat to skillet; top evenly with the stuffing mixture.

BROIL, 6 inches from heat source for 5 min. or until stuffing is lightly browned.