Heat oil in large soup kettle over medium-high heat. Add onions and peppers; sauté until tender, about 4 minutes. Add garlic cloves, chili powder, and oregano; sauté 1 minute longer.
Add tomatoes, broth, corn, chilies, beans and chicken; bring to a simmer. Reduce heat and simmer, partially covered, to blend flavors, about 20 minutes.
Stir in cilantro; let stand a couple of minutes. (after cooling, the soup can be refrigerated for up to 3 days). Serve warm with tortilla chips.