Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper.
In a medium bowl, toss the chicken pieces with chili powder, cumin, smoked paprika, garlic powder, onion powder, cayenne pepper (if using), salt, black pepper, and olive oil until evenly coated.
Spread the seasoned chicken in a single layer on one half of the prepared baking sheet.
Arrange the sliced bell peppers and red onion on the other half of the baking sheet.
Bake for 15-20 minutes, or until the chicken is cooked through and the vegetables are tender-crisp.
Warm the tortillas according to package directions.
Assemble your tacos by filling the warm tortillas with the chicken and roasted vegetables. Add your favorite toppings.
Notes
For a spicier taco, add more cayenne pepper or a pinch of red pepper flakes to the chicken seasoning.
If you don’t have chicken thighs, chicken breast can be used, but reduce the cooking time slightly to prevent drying out.
This recipe is a great base for meal planning, with leftovers easily stored for lunches.