Lightly season chicken with salt, pepper, and Creole seasoning (I used my homemade salt-free recipe; omit salt if using store-bought seasoning).
Heat a tablespoon of cooking oil over medium heat in a heavy-bottomed Dutch oven or pot.
Add the chicken and sauté until browned on both sides, 3-4 minutes on each side. Remove and set aside on a plate.
Add the sausage and cook until browned. Remove and set next to the chicken.
Add the remaining oil, butter, and flour, then cook on medium heat, stirring continuously, for 10-15 minutes or until it turns a rich dark brown color, just like chocolate. Please don't get distracted during this time, as it burns quickly.
When your roux has the desired color, add the onion, green pepper, and celery and cook for 6-7 minutes, stirring frequently.
Next, add the minced garlic, bay leaves, and thyme, and continue cooking for another 3 minutes.
Pour in the chicken broth, Creole seasoning, chicken bouillon or cubes, and paprika, and simmer for 5 minutes.
Toss the cooked chicken back into the pot and cook for another 15 minutes. Then add sausage and cook for about 5-10 minutes.
Stir in the filé powder, green onions, and chopped parsley.
Adjust the soup's thickness and flavor with broth or water and salt. The gumbo sauce should be thick. Serve with a steaming bowl of rice.