Preparation Coat chicken on all sides with cumin. Sprinkle with salt and pepper. Heat oil in heavy large pot over medium-high heat. Add chicken; sauté until browned on all sides, about 5 minutes. Add onion and sauté until beginning to brown, about 3 minutes. Add tomatoes with juice, broth, chipotle chilies, adobo sauce, and chocolate and bring to simmer. Reduce heat to medium-low and simmer until chicken is cooked through and sauce thickens slightly, about 20 minutes. Season with salt and pepper; serve.
Preparation Coat chicken on all sides with cumin. Sprinkle with salt and pepper. Heat oil in heavy large pot over medium-high heat. Add chicken; sauté until browned on all sides, about 5 minutes. Add onion and sauté until beginning to brown, about 3 minutes. Add tomatoes with juice, broth, chipotle chilies, adobo sauce, and chocolate and bring to simmer. Reduce heat to medium-low and simmer until chicken is cooked through and sauce thickens slightly, about 20 minutes. Season with salt and pepper; serve.