In a medium mixing bowl, combine the olive oil, chili powder, ground cumin, smoked paprika, garlic powder, onion powder, and a generous pinch of salt and pepper to create a flavorful marinade.
Add the chicken thighs into the marinade, ensuring each piece is thoroughly coated. Cover the bowl with plastic wrap and let it marinate for at least 30 minutes at room temperature, or refrigerate for up to overnight for a more pronounced flavor.
Preheat your grill or a non-stick skillet over medium-high heat. Once hot, remove the chicken from the marinade, letting any excess drip off, and carefully place it on the grill or skillet.
Grill or cook the chicken for approximately 6-7 minutes on each side, until it reaches an internal temperature of 165°F (75°C) and is cooked through with no pink remaining in the center.
After cooking, transfer the chicken to a cutting board and let it rest for about 5 minutes. This helps retain the juices. Once rested, slice the chicken into bite-sized pieces.
Meanwhile, heat the corn tortillas in a separate dry pan over medium heat for about 30 seconds on each side, until they become warm and pliable.
To assemble the tacos, lay a portion of the sliced chicken onto each warm tortilla. Top with generous amounts of chopped cilantro, diced red onion, and sliced avocado. If desired, add diced jalapeños for a spicy touch.
Just before serving, squeeze fresh lime juice over the assembled tacos for a zesty flavor boost.
Notes
Serve on a colorful platter with extra lime wedges and chopped cilantro.