Preheat medium stockpot on medium heat, add ghee. Once ghee/butter has melted, add onions, carrots, pepper, and celery, sauté for 3 minutes.
Add cubed chicken and dried spices to stockpot. Sauté for 7 minutes, stirring frequently.
Add black beans, diced tomatoes and stock. Stir until well mixed.
Cover and simmer on low heat for 1 hour.
Serve and garnish generously with avocado slices, cilantro leaves and plain greek yogurt!