Preheat the oven to 375 degrees F.
In a small bowl, mix together the cumin, 1 teaspoon of the chili powder, the garlic powder, and the salt.
Coat the chicken breasts evenly with 1 tablespoon of the olive oil.
Coat the chicken evenly with 1 teaspoon of the spice mixture. Set the remaining spice mixture aside.
Bake until the chicken is cooked through, reading 165 degrees F when a meat thermometer is inserted into the thickest part, for 15-20 minutes.
Remove the chicken from the oven, cut it into cubes, and set it aside.
Heat the remaining olive oil in a large pot over medium-high heat on the stovetop.
Add the onions, the red bell peppers, the green bell peppers, and the minced garlic.
Add in 1 tablespoon of the spice mixture.
Add the remaining chili powder.
Stir and cook the vegetables until they turn golden-brown, for 5 minutes.
Add the cubed chicken, the diced tomatoes and their juices, and the green chiles and their juices.
Pour in the chicken broth, 4 cups of the hot water, and the tomato paste. Stir to combine and bring to a boil.
Reduce the heat to low.
Add the black beans and stir.
In a separate bowl, mix together the cornmeal with the remaining room temperature water.
Add the cornmeal mixture to the pot and let the soup simmer for 10-15 minutes.
Add more of the spice mixture, as desired.
Cut the tortillas into uniform 2-3 inch strips. Stir a generous amount of them into the soup before serving, reserving the remainder for topping.
Turn off the heat and serve hot with your favorite toppings.