top each patty with 1 cheese slice; cook 2 minutes or until cheese melts and patties are desired degree of doneness. place 1 lettuce leaf on bottom half of each hamburger bun; top with 1 patty, 1 onion slice, 2 tomato slices, about 2 avocado slices, 2 pickle chips, about 1 1/2 tablespoons sauce, and top half of bun.