Make Roux: In a large Dutch oven or heavy-bottomed pot, heat vegetable oil over medium heat. Gradually add flour, stirring constantly until the mixture turns a dark brown color, resembling peanut butter, about 20-30 minutes.
Sauté Vegetables: Add diced onion, bell pepper, celery, and minced garlic to the roux. Cook for about 5 minutes until vegetables are softened.
Add Sausage and Chicken: Stir in sliced smoked sausage and diced chicken thighs. Cook for another 5 minutes until chicken is browned.
Pour Broth: Gradually pour in chicken broth, stirring continuously to prevent lumps.
Season: Add Worcestershire sauce, hot sauce, salt, black pepper, paprika, cayenne pepper, and bay leaves. Stir well to combine.
Simmer: Bring the gumbo to a boil, then reduce heat to low. Let it simmer uncovered for about 1 hour, stirring occasionally, until the gumbo thickens and flavors meld together.
Serve: Remove bay leaves and discard. Serve the gumbo hot over cooked rice, garnished with chopped green onions.
Enjoy your delicious Chicken and Sausage Gumbo!