In a large skillet, heat the olive oil over medium heat. Add the shredded chicken, chili powder, cumin, garlic powder, onion powder, salt, and black pepper. Stir to combine and cook for about 5 minutes, until heated through.
While the chicken is warming, heat the corn tortillas in a separate skillet or on a griddle for about 30 seconds on each side until they are soft and pliable.
Assemble the tacos by placing a generous portion of the seasoned chicken on each tortilla.
Top the chicken with diced tomatoes, shredded lettuce, diced red onion, and crumbled queso fresco.
Garnish with fresh cilantro and serve with lime wedges on the side for squeezing over the tacos.