Baked Chicken and Sausage Gumbo

Name: Baked Chicken and Sausage Gumbo
Ingredients: 1 cup all-purpose flour; 0.25 cup vegetable oil; 0.25 cup butter, melted; 6 bone-in, skin-on chicken thighs; 1 pound smoked pork sausage, cut into 2-inch pieces; kosher salt to taste; 1 large onion, diced; 1 cup diced celery; 1 cup diced green bell pepper; 6 cups chicken broth; 2 teaspoons kosher salt; 1 teaspoon ground black pepper; 0.5 teaspoon dried thyme; 0.25 teaspoon cayenne pepper, or to taste; 1 large bay leaf; 1 cup diced tomatoes; 1 cup frozen sliced okra, thawed; 4 green onions, chopped