Spread the refried beans on a large platter or plate.
Top the beans with the ground beef and onion mixture.
Cover the beef with shredded cheddar cheese.
Layer the tomatoes and olives on each end of the platter.
Scoop sour cream and guacamole into the middle.
Lay the shredded lettuce around the outside of the taco dip.
Serve with tortilla chips.