Heat oil in a large Dutch oven over medium-high heat. Add onion; sauté 10 minutes or until tender and golden. Add chili powder, garlic, and cumin; sauté for 2 minutes. Add oregano and beans; cook for 30 seconds. Add broth; bring to a simmer. Cook 20 minutes.
Place 2 cups of bean mixture in a blender or food processor, and process until smooth. Return pureed mixture to pan. Add turkey, and cook 5 minutes or until thoroughly heated. Remove from heat. Add diced tomato, chopped cilantro, lime juice, salt, and pepper, stirring well. Garnish with lime wedges, if desired.
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