In a Dutch oven over medium heat, cook chicken and onion in oil until lightly browned. Add garlic; cook 1 minute longer. Stir in the broth, chiles, cumin, oregano and cayenne; bring to a boil., Reduce heat to low. With a potato masher, mash one can of beans until smooth. Add to saucepan. Add remaining beans to saucepan. Simmer for 20-30 minutes or until chicken is no longer pink and onion is tender., Top each serving with cheese and, if desired, jalapeno pepper.