1In 1-quart saucepan, heat 2 inches of water to boiling. Add corn; reduce heat. Simmer uncovered 5 minutes; drain. Rinse with cold water; drain.
2In large salad bowl, mix mayonnaise, sour cream, lime juice and seasoning mix with wire whisk. Add chicken, corn, bell pepper and onions; toss to coat.
3Gently stir in avocado; sprinkle with cilantro.