Into a large pot, combine chicken broth, green enchilada sauce, black beans, chicken, corn and diced chiles. Stir to combine and then add cumin, garlic powder, chili powder, onion powder and salt. Stir, and bring to a boil. Cover and let simmer for 10 minutes. Prepare cornmeal dumplings.
For the Dumplings:
In a bowl, stir together the cornmeal, flour, baking powder, salt, and sugar. Add egg, milk and butter and stir to combine. Drop the batter by heaping tablespoons into the slowly simmering soup. Cover and cook for 15 minutes. Spoon the stew into bowls and top each serving with dumplings and your favorite toppings. Serve immediately.