Chicken and Smoked Sausage Gumbo

Name: Chicken and Smoked Sausage Gumbo
Ingredients: 1 cup vegetable oil; 1 cup all-purpose flour; 1 1/2 cups chopped onions; 1 cup chopped celery; 1 cup chopped bell peppers; 1 pound smoked sausage, such as andouille or kielbasa, cut crosswise into 1/2-inch slices; 1 1/2 teaspoons salt; 1/4 teaspoon cayenne; 3 bay leaves; 6 cups chicken broth; 1 pound boneless chicken meat, cut into 1-inch chunks; 1 teaspoon Rustic Rub, recipe follows; 2 tablespoons chopped fresh parsley leaves; 1/2 cup chopped green onions; 1 tablespoon file powder; 8 tablespoons paprika; 3 tablespoons cayenne; 5 tablespoons freshly ground black pepper; 6 tablespoons garlic powder; 3 tablespoons onion powder; 6 tablespoons salt; 2 1/2 tablespoons dried oregano; 2 1/2 tablespoons dried thyme