In a small bowl, mix together the chili powder, cumin, paprika, oregano, garlic powder, 1 teaspoon of salt, and ½ teaspoon of pepper.
Sprinkle the spice mixture evenly over the chicken thighs, ensuring each piece is coated well.
In a large cast iron skillet, heat the canola oil over medium-high heat until it shimmers.
Working in batches, place the seasoned chicken in the skillet in a single layer. Cook for about 4-5 minutes on each side, until golden brown and the internal temperature reaches 165 degrees F.
Remove from the skillet and let it cool for a few minutes before dicing into bite-size pieces.
Serve the chicken in warmed tortillas and top with pico de gallo, diced avocado, chopped cilantro, and a squeeze of lime.