In a small bowl, combine chili powder, cumin, paprika, oregano, garlic powder, 1 teaspoon salt and 1/2 teaspoon pepper. Season chicken with chili powder mixture.
Heat oil in a large skillet over medium high heat. Working in batches, add chicken to the skillet in a single layer and cook until golden brown and cooked through, reaching an internal temperature of 165 degrees F, about 4-5 minutes per side. Let cool before dicing into bite-size pieces.
Serve chicken in tortillas, topped with pico de gallo, avocado, cilantro and lime.