HEAT oil in large skillet on medium-high heat. Add steaks; cook 1 min. on each side or until lightly browned on both sides.
MEANWHILE, mix tomatoes, peppers and dressing; spoon over steaks. Top with prepared stuffing; sprinkle with cheese.
REDUCE heat to medium-low; cover. Simmer 3 to 5 min. or until cheese is melted and steak is cooked to medium doneness (160°F.)