Lightly season chicken with salt, pepper, and Creole seasoning (I used my homemade salt-free recipe, omit salt if using store-bought seasoning).
Heat 2 tablespoons cooking oil over medium heat in a heavy-bottomed Dutch Cook or pot.
Add the chicken and sauté until browned on both sides, about 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.
Pour in remaining oil, butter, and flour, then cook on medium heat, stirring continuously, for about 10-15 minutes or until it turns a rich dark brown color - just like chocolate. (Check out How to Make Roux for detailed instructions.) Don't get distracted during this time, as it might burn.
When your roux has achieved the desired color, add the onion, green pepper, and celery to the pot and cook for about 6-7 minutes – stirring frequently.
Next, add minced garlic, bay leaves, and thyme - continue cooking for another 3 minutes.
Pour in chicken broth, Creole seasoning, chicken bouillon or cubes, paprika, and let it cook for 5 minutes.
Toss the cooked chicken back in the pot and cook for about 15 minutes. Then add sausage cook for about 5-10 minutes.
Then stir in filé powder, green onions, and chopped parsley.
Adjust thickness soup and flavor with broth or water and salt. The gumbo sauce should be thick.
Serve with cooked rice.