Heat the vegetable oil in a large Dutch oven or stockpot.
For 10-15 minutes, whisk continuously until the flour turns a dark brown color.
To the roux, add the onion, bell pepper, celery, and garlic, and cook for about 5-7 minutes, or until the vegetables are tender.
Cook the chicken in the pot for 5-7 minutes, until it is no longer pink. Add the onion and andouille sausage to the pot, and stir to combine.
Stir the chicken broth well into the mixture.
Combine the paprika, garlic powder, onion powder, oregano, thyme, cayenne pepper, salt, and black pepper with the bay leaves.
Stir the gumbo occasionally for 30 to 45 minutes after it has been brought to a simmer.
Let the shrimp cook until they are pink and fully cooked for 5-7 minutes.
Allow the gumbo to simmer for a few more minutes after adding the chopped parsley and green onions.
Overcooked white rice, serve the gumbo without the bay leaves.