Chicken Gumbo

1 tsp vegetable oil
1/4 C flour
3 C low-sodium chicken broth
1 1/2 lb chicken breast, skinless,
boneless, cut into 1-inch strips
1 C (1/2 lb) white potatoes, cubed
1 C onions, chopped
1 C (1/2 lb) carrots, coarsely chopped
1/2 medium carrot, grated
1/4 C celery, chopped
4 cloves garlic, finely minced
2 stalks scallion, chopped
1 whole bay leaf
1/2 tsp thyme
1/2 tsp black pepper, ground
2 tsp hot (or jalapeño) pepper
1 C (1/2 lb) okra, sliced into 1/2-inch pieces