American Kitchen Classic Louisiana Gumbo

Name: American Kitchen Classic Louisiana Gumbo
Ingredients: 1 lb andouille sausage, sliced; 1 lb boneless skinless chicken breasts, cut into 1-inch pieces or 1 lb chicken thigh; 1⁄2 cup butter, cubed; 3⁄4 cup all-purpose flour; 2 1⁄2 cups yellow onions, chopped; 2 cups green bell peppers, chopped; 1 1⁄2 cups celery, chopped; 1 tablespoon garlic, minced; 6 cups reduced-sodium chicken broth; 2 (14 1/2 ounce) cans diced tomatoes, undrained (Hunts); 1 1⁄2 teaspoons kosher salt; 1 teaspoon ground black pepper; 1⁄2 teaspoon ground thyme; 1⁄4 teaspoon ground red pepper; 1 lb shrimp, thawed if frozen-peeled and deveined; 1 (16 ounce) bag frozen cut okra; 1 tablespoon file powder; hot cooked rice (optional)