Place chicken in a 4 quart slow cooker. Top with beans and corn. In a medium bowl, combine taco seasoning, chilies, condensed soup, and chicken broth. Pour over top of ingredients in the crock pot. Cover and cook on low for 6 to 8 hours. Before serving, stir gently to break up chicken, then stir in the sour cream. Serve topped with green onions and jack cheese, if desired.