To a 1.5 quart dutch oven, add in 1 tbsp of oil and brown chicken and sausage on medium low heat. Once a crust has formed on the chicken, remove, scrape any fond out of the pout as well, and set to the side.
Lower heat to low, Add the remaining oil to the pot, along with the flour and stir constantly until the roux reaches a chocolate color. This will take anywhere form 30-40 minutes.
Add in onion, celery, and bell pepper, and allow to sauté for about 90 seconds. Follow with garlic and sauté until fragrant
Slowly pour in chicken stock and stir to allow the roux to combine with the stock. Increase the heat to medium
Add back the chicken and sauces, and add in all spices except for the gumbo file. Allow to simmer for 10 minutes.
Turn the heat off, add in shrimp and gumbo file, and allow to simmer for 5 minutes before serving, ensuring the shrimp is fully cooked through