1. Heat oil in a medium saucepan over medium heat. Add onion, garlic, chipotle, chili powder, and 2 teaspoons salt and cook until onion softens, about 5 minutes. Add chicken broth, bring to a boil, reduce heat to a simmer and cook uncovered, for 10 minutes. Add corn and cook for 5 minutes more.
2. Remove soup from heat and stir in tomato, chicken, cilantro, and lime juice. Divide tortilla chips among 4 warmed bowls, ladle soup on top, and serve. Serve with lime wedges, if desired.
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