Heat the oil in a medium saucepan over medium heat. Add the onion, celery, garlic, chili powder, cumin and coriander and cook, stirring occasionally, until the onion is soft, about 5 minutes. Add the chicken broth and 2 cups of water and bring to a boil. Reduce the heat to maintain a simmer and cook for 10 minutes. Add the chilies, corn, oregano and tomatoes and cook for another 5 minutes.
Add the chicken and stir until heated through, remove the saucepan from the heat. Add the cilantro and lime juice. Season with salt and pepper. Serve with sour cream and/or pickled jalapenos and cilantro for topping.
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