In a small bowl, mash half of beans. Transfer mashed and remaining beans to a Dutch oven. Add the tomatoes, broth, water, cumin and chipotle pepper. Bring to a boil. Reduce heat; cover and simmer for 15 minutes. Add chicken., In a small bowl, combine the egg, egg white, muffin mix and baking mix; stir in milk. Drop by tablespoonfuls onto simmering soup. Cover and simmer until a toothpick inserted in a dumpling comes out clean (do not lift the cover while simmering), 10-12 minutes. Ladle soup into bowls. Sprinkle each serving with cilantro if desired.