How to make the best white chicken chili

1 lb. Italian white kidney beans,
2 oz. green pepper,
2 oz. red pepper,
3 T. chili powder,
1 T. oregano,
1 T. cumin,
1/2 c. minced cilantro,
8 oz. onions,
2 oz. celery,
8 garlic cloves,
1/2 tsp. cayenne pepper,
4&1/2 lb. chicken leg,
3 bay leaf,
1/2 c. scallions,
1 T. lemon juice