Heat oil in a 5 quart saute pan over medium heat. Add chicken, stirring often, until chicken is cooked through. Remove chicken to a 5 quart or larger dutch oven. Cover, and keep warm.
Add the onion to the drippings in the saute pan, and cook over medium heat for 3 or 4 minutes. Stir in broth, green chiles, and spice blend; simmer uncovered for 30 minutes. Pour this over the chicken that's in the Dutch oven, and add the beans.
Cover and simmer for at least 10 minutes. Salt to taste. Garnish with Monterey Jack cheese, sour cream, and onions if desired. Serve with corn bread or corn chips.