In a medium fry pan let your pad of butter melt over medium low heat until melted. Then add your onions and celery and banana peppers saute but not burn about 10 minutes or until somewhat soft, watch closely.
In a dutch oven pot over a low/medium heat, add your butter/onion mixture and chicken stock. Then add navy beans, shredded chicken, salsa, and black bean soup. Cook about 20 minutes, or until chili has heated through and serve.