Heat oil in a large Dutch oven over medium-high heat; gradually whisk in flour, and cook, whisking constantly, 5 minutes or until flour is chocolate colored. (Do not burn mixture.)
Reduce heat to medium. Stir in onion and next 4 ingredients, and cook, stirring constantly, 3 minutes. Gradually stir in chicken broth and sausage. Increase heat to medium-high, and bring to a boil. Reduce heat to low, and simmer, stirring occasionally, 20 minutes.
Meanwhile, prepare Okra Pilau. Stir chicken into gumbo; cook, stirring occasionally, 5 minutes. Serve with Okra Pilau.
Kitchen Express Note: We love the flavor of fresh onion, bell pepper, and celery, but to make it even quicker you can substitute 1 (10-oz.) package frozen diced onion, red and green bell peppers, and celery.