01 - Pat the chicken pieces dry with paper towels and season generously with kosher salt and freshly ground black pepper on all sides.
02 - Heat vegetable oil in a large Dutch oven over medium-high heat. Add chicken pieces in batches, cooking 4–5 minutes per side until golden brown. Transfer browned chicken to a plate and reserve.
03 - Reduce heat to medium. Melt butter in the same pot. Gradually whisk in flour and cook, stirring constantly, for 12–15 minutes until roux reaches a deep chocolate brown color. Stir continuously to prevent burning.
04 - Add chopped onion, bell pepper, celery, and minced garlic to the roux. Cook for 5 minutes, stirring frequently, until vegetables are softened and fragrant.
05 - Stir in Cajun seasoning, dried thyme, and bay leaves. Pour in chicken stock, water, Worcestershire sauce, and hot sauce. Scrape up any browned bits from the bottom of the pot.
06 - Return browned chicken and any accumulated juices to the pot. Bring to a gentle simmer, then cover and reduce heat to low. Cook for 45 minutes, stirring occasionally, until chicken is tender and sauce has thickened.
07 - Remove and discard bay leaves. Taste and adjust seasoning if necessary. Serve immediately over fluffy white rice, garnished with chopped fresh parsley.