Cook ground beef and onion in a large skillet over medium heat until browned, stirring until meat crumbles. Drain and return to skillet. Add corn, beans, and seasoning mix; stir well.
Layer corn chips, beef mixture, and lettuce evenly on individual serving plates. Top evenly with shredded cheese, tomato, and olives.
Beat cream cheese at medium speed of an electric mixer until light and fluffy. Add avocado and remaining ingredients; beat well. Serve avocado mixture with salad.