Make the Roux: In a large Dutch oven, heat vegetable oil over medium-low heat. Gradually whisk in the flour, stirring constantly until it turns a deep chocolate brown (about 20-30 minutes). Be patient and don’t stop stirring to avoid burning.
Sauté the Trinity: Add the diced onion, bell pepper, and celery to the roux. Stir well and cook for 5-7 minutes until softened. Add the minced garlic and cook for another minute.
Brown the Sausage & Chicken: Stir in the sliced andouille sausage, letting it brown slightly to release its smoky flavor. Add the chicken thighs, searing them for 3-4 minutes on each side.
Add the Stock & Seasonings: Pour in the chicken stock and stir to combine. Add salt, black pepper, smoked paprika, thyme, cayenne, bay leaves, and Worcestershire sauce. Bring to a simmer.
Simmer Low & Slow: Reduce heat to low and let the gumbo simmer uncovered for 1 to 1.5 hours, stirring occasionally. If using bone-in chicken, remove, shred, and return to the pot.
Thicken the Gumbo: Stir in the okra and let it cook for another 10-15 minutes. If skipping okra, use filé powder at the end instead.
Final Touches: Remove from heat and stir in the filé powder (if using). Let the gumbo sit for 5 minutes before serving.
Serve & Enjoy: Spoon over cooked white rice, garnish with green onions, and add a dash of hot sauce for extra spice.