Preheat oven to 400°F (200°C).
In a small bowl, combine chili powder, cumin, smoked paprika, garlic powder, onion powder, salt, and black pepper.
Place the chicken strips, bell peppers, and onion wedges on a large 13x18 inch rimmed baking sheet.
Drizzle olive oil over the chicken and vegetables, then sprinkle evenly with the prepared spice blend.
Toss all ingredients on the pan until thoroughly coated, then spread into a single, even layer.
Roast for 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and vegetables are tender with slightly charred edges.
Remove from oven and squeeze fresh lime juice over the pan.
Serve immediately with warmed flour tortillas and optional toppings like sour cream or cilantro.