Whisk together (or shake in a jar) all dressing ingredients until combined. In a large bowl, toss chicken, corn, tomatoes, beans, green onions, olives, and red pepper with about 1/2 to 2/3 of the dressing. Cover and refrigerate for at least an hour or up to 8 hours.

When ready to serve, toss the chicken mixture with the lettuce, cilantro, avocados, cheese and the remaining dressing (to taste). Serve immediately with sour cream, crushed tortilla chips and salsa. Also, have breadsticks, biscuits, or other bread on the side.