Preheat the oven to 425°F (220°C) and line a baking sheet with parchment paper to prevent sticking.
Trim any excess fat from the chicken thighs and cut into bite-sized pieces for even cooking.
In a small bowl, whisk together olive oil, ground cumin, smoked paprika, garlic powder, chili powder, salt, and pepper. Toss the chicken pieces with the spice mixture until thoroughly coated.
Spread the seasoned chicken on the prepared baking sheet in a single layer. Bake for 14–16 minutes, until the internal temperature reaches 165°F (74°C) and the edges are lightly caramelized.
While the chicken cooks, warm the tortillas in a separate skillet over medium heat for about 20–30 seconds per side, or until warm and pliable.
Optional: For extra crispiness, lightly brush or spray the tortillas with a bit more oil and bake them for 2–3 minutes on a separate rack until they look slightly golden.
Mix the crema with lime juice and a pinch of salt. Stir in half of the chopped cilantro.
Assemble tacos: place a portion of chicken in each tortilla, top with shredded lettuce or cabbage if using, add a spoonful of pico de gallo, drizzle with lime crema, and finish with a sprinkle of cilantro.
Serve immediately for the best contrast of textures—crisp shells, juicy chicken, and cool toppings.