HEAT oven to 350ºF.
COOK meatballs as directed on package; cut in half. Place in large bowl. Add steak sauce and salsa; toss to coat. Cut cheese slices in half.
PLACE crackers in single layer on baking sheet; top with cheese and meatballs.
BAKE 4 to 5 min. or until cheese is melted. Top with olives.