Cook rice and bay leaf according to rice package directions, omitting salt and fat; drain. Discard bay leaf.
Heat a saucepan over medium-high heat, and coat pan with cooking spray. Sprinkle chicken with salt and black pepper. Sauté chicken in pan for 5 minutes. Add broth and 2 cups water; bring to a boil. Reduce heat; simmer 20 minutes. Remove chicken; shred. Reserve cooking liquid.
Cook flour and oil in a cast-iron skillet 15 minutes over medium heat, stirring constantly. Add onion, bell pepper, 1/2 cup celery, and garlic; cook for 4 minutes. Add cooking liquid, chicken, okra, Cajun seasoning, and hot sauce. Cook for 3 minutes. Serve over rice; sprinkle with green onions.