First Step: Prep Vegetables and Spice Mix
Dice 1 medium green bell pepper, 1 medium yellow onion, and 3 celery stalks into even pieces and combine in a bowl. In another small bowl, mix 6 minced garlic cloves, chopped parsley (if using), 2 tablespoons Cajun seasoning, 2 teaspoons dried thyme, 2 bay leaves, and ½ teaspoon cayenne pepper. Set aside for later layering of flavors.

Second Step: Season Chicken and Prepare Meats
If using raw chicken thighs, dice them into 1-inch pieces, then season with kosher salt, freshly ground black pepper, and the remaining Cajun seasoning. If using rotisserie chicken, shred the meat. This adds tender protein with a bold seasoning foundation.

Third Step: Brown the Andouille Sausage
In a large heavy pot over medium-high heat, brown the sliced andouille sausage until caramelized and slightly crisp. Transfer to a plate to avoid overcooking. Browning releases oils and smoky flavors, critical for authentic gumbo depth.

Fourth Step: Brown the Chicken
Using the fat rendered from the sausage or with 1 tablespoon of neutral oil, brown the seasoned chicken pieces in the same pot, developing rich flavor and sealing in juices. Once browned, set aside with the sausage.

Fifth Step: Make the Roux
Reduce heat to medium and add 4 tablespoons unsalted butter and ¼ cup neutral oil to the pot. Gradually whisk in ½ cup all-purpose flour, stirring constantly to prevent burning. Cook the roux slowly for 10 to 20 minutes, stirring often, until it reaches a milk chocolate brown color, imparting the nutty, deep flavor gumbo is known for. (Alternatively, bake the roux in the oven at low heat, but this requires more time.)

Sixth Step: Sauté Vegetable Base in Roux
Add the diced bell pepper, onion, and celery mixture to the roux and cook for about 10 minutes until the onions turn translucent and vegetables soften, building a savory foundation.

Seventh Step: Incorporate Garlic, Spices, and Meats
Stir in the garlic and spice blend, then add the browned sausage, chicken, and collected juices. Cook for 2 to 3 minutes until fragrant to meld flavors.

Eighth Step: Add Broth and Simmer
Slowly pour in 6 cups of room-temperature low-sodium chicken broth, stirring to combine. Bring to a boil over medium heat, then reduce to medium-low and simmer uncovered for 35 to 45 minutes, allowing the gumbo to thicken and flavors meld.

Ninth Step: Final Seasoning Adjustments
Taste and adjust seasoning with additional salt, Cajun seasoning, or cayenne pepper as desired to tailor spice and salt levels.

Tenth Step: Prepare Garnishes and Serve
Thinly slice ½ bunch of scallions and cook 3 cups of white rice as the gumbo simmers. Serve the hot gumbo ladled over rice, topped with sliced scallions and hot sauce, and optionally sprinkle with filé powder for extra herbal flavor and thickness.