Preheat oven to 450°F and line a large sheet pan with aluminum foil.
In a large bowl, combine chicken strips, bell peppers, and onion.
In a small bowl, whisk together olive oil, lime juice, chili powder, cumin, garlic powder, paprika, salt, and pepper.
Pour the seasoning mixture over the chicken and vegetables, tossing until everything is well coated.
Spread the mixture in a single layer on the prepared sheet pan.
Roast for 20-25 minutes, stirring halfway through, until chicken is cooked through and vegetables are charred at the edges.
Serve immediately with warm tortillas and your favorite toppings like sour cream, guacamole, cheese, and salsa.