3 tablespoons cooking oil
3 tablespoons flour
1 onion, chopped
2 ribs celery, chopped
1 green bell pepper, chopped
1 10-ounce package frozen sliced okra
1 bay leaf
1 1/2 teaspoons dried thyme
1 teaspoon dried oregano
2 teaspoons salt
1/4 teaspoon fresh-ground black pepper
1/4 teaspoon cayenne
1 3/4 cups crushed canned tomatoes in thick puree (one 15-ounce can)
1 quart canned low-sodium chicken broth or homemade stock
1/2 pound smoked sausage, halved lengthwise and cut crosswise into 1/4-inch slices
1 pound boneless, skinless chicken breasts, cut into 3/4-inch pieces
3/4 cup long-grain rice
In a large stainless-steel pot, heat the oil over moderate heat. Whisk in the flour and cook, whisking, until starting to brown, about 4 minutes. Reduce the heat to moderately low. Stir in the onion, celery, and bell pepper and cook until starting to soften, about 7 minutes. Add the okra, bay leaf, thyme, oregano, salt, black pepper, cayenne, and tomatoes. Cover and cook for 5 minutes.
Stir in the broth and the smoked sausage. Bring to a boil. Reduce the heat and simmer for 15 minutes. Add the chicken and cook until just done, 4 to 5 minutes longer. Remove the bay leaf.
Meanwhile, bring a medium pot of salted water to a boil. Stir in the rice and boil until just done, 10 to 12 minutes. Drain. Put a mound of rice in the center of each bowl. Ladle the gumbo around the rice.