Cut the breasts into bite-size pieces, place them in a mixing bowl and season them with the chicken seasoning mix. In a black iron pot, heat the oil over medium heat. Sautee the chicken until lightly browned, about 5-7 minutes. Remove the chicken and set aside.
Add the flour to the oil and make a medium-brown roux, stirring constantly. Add the tomato sauce, the onion, celery, bell pepper, and garlic and the chicken stock and bring to a hard boil. Reduce heat and simmer for 10 minutes, then add the chicken and simmer for another 10 minutes. Add the rice, stir well, and simmer for another 5 minutes. Add the green onion tops, parsley, salt, black and white pepper, and hot sauce. Mix thoroughly and pour into a lightly greased baking dish. Sprinkle with the bread crumbs and top with pieces of butter. Bake at 350° for 20 minutes.
This serves six and freezes well. To reheat, thaw in the refrigerator and bake at 350° for 20 minutes.