HEAT oven to 400ºF.
SPOON cheese into 6 mounds, 3 inches apart, on baking sheet sprayed with cooking spray; flatten slightly. Bake 6 min. or golden brown, carefully turning after 5 min. Remove to wire racks; cool.
PLACE lettuce in 6 (8-oz.) glasses. Thread 2 tomatoes and 1 onion alternately onto each of 6 skewers. Add to glasses. Drizzle with dressing.
TOP with cheese crisps.