In a large stockpot, combine oil and flour and cook over medium-high heat for about 15 minutes, stirring almost constantly, until mixture turns very dark brown, almost between brown and black. This is your roux.
Add onions, parsley, celery, bell peppers, scallions and garlic to the roux and cook about 10 more minutes, stirring regularly, until vegetables are tender.
Add chicken broth, salt, and creole seasoning to the pot.
Cover pot and simmer for 15 minutes, stirring occasionally.
Add your chosen meat and simmer an additional 10 minutes until cooked through.
Ladle over steamed white rice and serve immediately.