1. In a large pot, heat some oil over medium heat. Add the chopped onion and minced garlic, and sauté until fragrant.
2. Add the chicken breast to the pot and cook until browned on all sides.
3. Pour in the chicken broth, diced tomatoes, and corn. Stir in the cumin and chili powder. Bring to a boil, then reduce heat and let it simmer for about 20 minutes.
4. Remove the chicken breast from the pot, shred it using two forks, and return it to the pot. Season with salt and pepper to taste.
5. Serve hot, garnished with chopped cilantro and lime wedges on the side.