2 bell peppers
1/2 red onion
1 1/2 lbs (675 g) boneless, skinless chicken breasts or flank steak
1–2 tbsp Taco Seasoning
2 tbsp oil
12 small whole-grain or corn tortillas
1 cup grated cheese, preferably low fat
Optional toppings:
1 recipe prepared Guacamole
1 recipe prepared Poco Picante Salsa