Whisk together the flour and oil over medium low heat for 45 minutes to an hour to create a dark roux. This adds a deep rich flavor to the gumboand can be done ahead to time.
Once the roux is ready set it aside, slice the sausages, add cut the seasoned chicken breast into cubes
Add the oil to a deep pot and sear the sausages on both sides
Remove the sausages and sear the chicken, remove the chicken and set aside
To the pot add the celery, onion, carrots and peppers and sauté until fragrant and softened
Add the dark roux, chicken broth, garlic and thyme
Allow it to thicken, then stir in chicken and sausages
Season with salt/all purpose to taste if needed
Serve over a bed of white rice