Chicken, Sausage, and Shrimp Gumbo

We eat on a pot of soup all week during the winter months. This is a good one.
Ingredients:
1/2 cup all-purpose flour                                      1 lb. reduced-fat smoked sausage, sliced
Cooking spray                                                     1 large onion, chopped
2 ribs celery, chopped                                         1 small bell pepper, chopped
4 garlic cloves, minced                                        1/2 teaspoon dried thyme
1/2 teaspoon ground red pepper                          2 boneless chicken breast, chopped -if you cut while
1 and 1/2- 32oz container chicken broth                           partially frozen,it is easier      
1-14 oz can diced tomatoes                                 1/2 lb. peeled and deveined shrimp   
1- 10oz. package  frozen okra (optional)              Hot cooked rice
Cook flour in a dutch oven over medium heat, stirring constantly, 10 min. (It will burn if you don't watch it. Remove from heat. Saute sausage in a dutch oven coated with cooking spray over medium-high heat. Add onion, celery, bell pepper, garlic cloves, thyme , and red pepper.  Saute for 5 min. Add chicken, and saute 3 min. Stir in flour until blended. Gradually add broth and tomatoes. Reduce heat to low, and simmer 30 min. Add shrimp and, if desired, okra. Simmer 20 min. Serve with cooked rice.