Chicken and Sausage Gumbo Recipe

Name: Chicken and Sausage Gumbo Recipe
Cuisine: Southern, American
Ingredients: 2 pounds boneless, skinless chicken thighs, cut into quarter size pieces; 1 tablespoon kosher salt; 1 teaspoon finely ground black pepper; 1 teaspoon cayenne pepper; 1 tablespoon paprika; 1/2 teaspoon garlic powder; 1/2 teaspoon onion powder; 1/2 teaspoon celery salt; 1 ½ cups flour; 2 ½ cups vegetable oil; 1 cup finely chopped onion; 1 cup finely chopped celery; 1 cup finely chopped green pepper; 8 cups chicken broth; 1 ¾ cups chopped or thinly sliced smoked pork sausage, such as andouille; 2 bay leaves; 2 cups cooked rice or potato salad, for serving; 2 teaspoons file powder (optional); 1 bunch scallions, thinly sliced