1 Tbsp oil. Soften onion, bell pepper, celery, carrot, garlic in dutch oven, 8-10 mins. Move to slow cooker
1 tbsp oil in dutch oven, stir in flour until golden brown. About 4 mins. Pour in the broth and bring to a boil. Transfer to slow cooker.
Low 6-8 hours. Remove bay leaf before serving
Serve over rice.