Directions:

Rinse cooked pasta with cold water and drain; set aside.

Combine sour cream, mayonnaise, mustard and vinegar in a large bowl. Add pasta, carrots, celery, peppers, tomatoes, green onions and chicken. Toss gently to coat evenly. Season to taste with salt and pepper.

Cover; chill in refrigerator 30 minutes. Stir before serving.