In a large Dutch oven over medium-high heat, add the ground beef and cook for 2 minutes. Next, add the onions, chili powder and cumin, and stir together. Add the cocoa, garlic and jalapenos, mix together and cook for 2 minutes. Next, add in the ranch-style beans, cayenne pepper and oregano, and cook for another minute. Add the black beans, diced tomatoes, tomato sauce and broth, cover and simmer for 1 hour, stirring occasionally.
Garnish with sour cream, shredded cheese and chives if desired.