SEASON beef patties with salt and pepper.
FOR each serving: Cook 1 beef patty on medium-high heat 6 min. on each side or to medium (160ºF), or desired doneness. Top with 1 cheese slice; continue cooking just until melted. Meanwhile, brush cut sides of 1 roll with 1 Tbsp. butter; toast on griddle.
SPREAD each cut side of roll with 1 Tbsp. steak sauce. Top bottom half of roll with 1 lettuce leaf, 2 tomato slices, burger, 1/2 oz. jalapeno slices and 2 Tbsp. guacamole; cover with top of roll.