Add olive oil, garlic, chipotle powder, cumin, oregano, salt and pepper to a large Ziploc bag. Add chicken strips, peppers, and onion to the bag. Seal and give a shake to coat completely.
Let marinade in the refrigerator for at least an hour.
Preheat oven to 400° F. Line a baking sheet with aluminum foil.
Spread the chicken and vegetables in a single layer on the pan. Bake for 20 to 25 minutes, or until cooked through.
Serve on tortillas and add lettuce, cheese, cilantro, sour cream and salsa, or your desired toppings. Spritz with lime.