In a large skillet over medium heat, cook beef until no longer pink; drain. Season with salt and pepper; set aside. Heat beans in a small saucepan.
Divide meat mixture and beans into six portions. Assemble in layers on six plates the following: first layer—corn chips; second layer—beef mixture; third layer—cheese; fourth layer—chili beans; fifth layer—lettuce; and sixth layer—tomato, green pepper, onions, avocado and, if desired, olives. Top with a dollop of sour cream; pour salsa over all.