Preheat the oven to 425. Line a large baking sheet with foil and spray with non-stick spray.
Slice your chicken, peppers and onions into thin strips and scatter them on your baking sheet. Drizzle with the olive oil.
In a small bowl, combine the chipotle powder, oregano, cilantro, cumin, paprika, salt and pepper. Sprinkle the seasoning mixture all over the top of the chicken and veggies and use your hands to rub the seasoning in to the chicken and mesh everything together. Spread it all out to a single layer. (Wash your hands well after this β itβs raw chicken!)
Bake at 425 on the top rack for 15-17 minutes or until the chicken is almost cooked through. Turn on the broiler and broil for an additional 2-3 minutes to give it a slight char. (Chicken must be at least 165 to be done β I always check mine with an instant thermometer.)
Optional: wrap tortillas in foil and add to the oven 5-7 minutes prior to the fajitas being done.
Serve with your choice of tortillas, black beans, rice, sour cream, tomatoes, shredded lettuce, cheese, salsa, guacamole and fresh limes.