Chicken and Andouille Sausage Gumbo

Name: Chicken and Andouille Sausage Gumbo
Ingredients: ½ cups Plus 1 Tablespoon Vegetable Oil; 12 ounces, weight Andoille Sausage, Diced; 4 pounds Boneless, Skinless Chicken Breasts; 1 Tablespoon Cajun/Creole Seasoning; 1 cup Flour; 2 cups Yellow Onion, Diced; 1 cup Celery, Diced; 1 cup Red Bell Pepper, Diced; 9 cups Chicken Stock; 1 teaspoon Salt; ¼ teaspoons Cayenne Pepper; 3 leaves Bay Leaves; ½ cups Green Onions, Chopped; 2 Tablespoons Parsley, Chopped; 1 Tablespoon Filé Powder; 2 cups Cooked White Rice