Preheat the oven to 350˚F.
In a small bowl, combine the chili powder, cumin, oregano, black pepper, and salt. Rub the chicken on both sides with the spice mixture until well-coated. Heat the olive oil in a large skillet over medium-high heat. Sear the chicken, scored-side-down, in the skillet for 5-8 minutes. Flip, and cook the other side for another 5 minutes, Transfer to a small sheet pan or baking dish (do not wash the skillet), and bake for 10-15 minutes, until the internal temperture has reached 165˚F. Remove from oven and allow to rest.
Combine the diced tomato, onion, jalapeño, and garlic in a medium bowl. Fold in the cilantro, and set aside.
Heat the skillet over medium heat. Add the lime juice and water, and scrape up browned bits from the bottom of the pan, and cook for 10 minutes, until the liquid has reduced. Stir in the corn and black beans, and simmer for 6-8 minutes. Return the chicken breasts to the skillet, stir, and cook until heated through. Add the prepared tomato salsa to the pan, and toss until incorporated. Serve.