Preheat your oven to broil. Ensure one of your rack is in the top slot.
Spray cooking oil on your sheet pan. Set aside.
In a large bowl mix together olive oil, chili powder, cumin, garlic powder, salt and pepper. Add onions and peppers and toss until coated. Remove onions and peppers shaking off any excess oil and add to one side of sheet pan.
Toss chicken in remaining spice and oil mixture mixing to combine flavours. Add to other side of sheet pan.
Broil about 10-12 minutes, stirring after 5 minutes, or until chicken is cooked through. There will be liquid in the pan from the chicken.
Serve immediately with warmed tortillas and whatever extras you enjoy.
