- To make the hard taco shells,* preheat the oven to 350°F and place one oven rack in the middle position, with at least 4” of room between that oven rack and any others. 
- Place the tortillas in the microwave for 30 seconds to make them pliable. 
- Pull the oven rack out and drape each tortilla over two bars of the rack to make a U-shape taco shell. 
- Bake for 12-15 minutes, until the tortillas are browned and crispy. 
- Remove from the oven, and cool on a baking sheet. 
- To make the chicken filling, in a medium bowl, combine the garlic powder, chili powder, paprika, cumin, dried oregano, sea salt, and ground black pepper. 
- Toss the chicken pieces in the seasoning mixture until completely coated. 
- Heat the avocado oil in a large skillet over medium heat. 
- Add the coated chicken to the skillet in a single layer and cook until golden brown and cooked through, about 8 minutes. 
- Add pico de gallo, avocado, and one-eighth of the chicken to each taco shell. 
- Top with sour cream, chopped cilantro, and squeezed lime juice.