01 - Pat the chicken pieces dry with paper towels and season evenly 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 set aside.
03 - Reduce heat to medium. In the same pot, melt butter. Stir in flour and cook, stirring constantly, for 12–15 minutes until the roux reaches a deep chocolate brown color. Do not leave unattended; continuous stirring prevents burning.
04 - Add chopped onion, bell pepper, celery, and 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. Use a wooden spoon to scrape up any browned bits from the bottom of the pot.
06 - Return browned chicken and any accumulated juices to the pot. Bring the mixture to a gentle simmer, then cover and reduce heat to low.
07 - Simmer covered for 45 minutes, stirring occasionally, until chicken is tender and sauce has thickened to desired consistency.
08 - Remove and discard bay leaves. Taste and adjust seasoning if necessary. Serve hot over fluffy white rice, garnished with chopped fresh parsley.