Preheat the oven to 425°F (220°C) and lightly grease a large sheet pan.
In a small bowl, mix together the chili powder, smoked paprika, cumin, garlic powder, onion powder, oregano, cayenne, salt, and black pepper.
Place the sliced chicken, peppers, and onion into a large mixing bowl.
Drizzle with olive oil and lime juice.
Sprinkle the seasoning mixture over everything and toss until evenly coated.
Spread the chicken and vegetables into a single layer on the prepared sheet pan.
Roast for 20 to 25 minutes, stirring halfway through, until the chicken is fully cooked and the vegetables are tender with lightly charred edges.
For extra browning, broil for 2 to 3 minutes at the end.
Serve immediately in warm tortillas with your favorite toppings.