Spread beans in a shallow 2-1/2-qt. dish. In a small bowl, combine sour cream, mayonnaise and taco seasoning; spread over beans. Sprinkle with chiles.
In a large bowl, mash avocados with the lime juice, salt and garlic powder. Spread over the chilies. Sprinkle with the cheese, onions, tomato and olives. Cover and refrigerate until serving. Serve with tortilla chips.