In large heavy pot or Dutch oven heat 1 tablespoon oil (med-hi heat) cook sausage until browned. Remove with slotted spoon, set aside.
Season chicken with Creole seasoning.
In fat left in pan brown chicken 5-6 minutes. Remove from pan and set aside.
Add 1/2 cup oil and flour to pan and over medium heat cook, stirring slowly and constantly for 25-30 minutes, to make a dark brown roux. Do Not let burn!!
Add onions, celery and pepper and cook, stirring until very soft 10-12 minutes.
Slowly add the chicken stock, bay leaves, and thyme, cayenne, stirring until well combined.
Bring mixture to a boil, then reduce heat to medium-low.
Add sausage and chicken, combine and continue to cook (simmer) uncovered, stirring occasionally until chicken is very tender. At least 3 hours.
Prior to serving discard bay leaves, stir in green onions, parsley and file powder.
Cook white rice in rice cooker (as per rice cooker instructions).
Spoon rice into deep bowls and ladle the gumbo on top.
Serve with hot sauce on the side.