Preheat oven to 400 degrees.
Mix all the spices in a small bowl and set aside.
Slice onion and pepper and place in a 13x9 casserole dish.
Slice chicken into strips and place in the dish with the peppers and onions.
Sprinkle seasoning blend over meat and veggies. Drizzle with olive oil and toss until everything is evenly coated.
Bake at 400 degrees for 35-40 minutes, stirring once.
Serve in tortillas with your favorite fajita toppings or over a bed of rice.