Yamina's fajitas

In an oven-proof dish (e.g. pyrex) marinate the chicken breasts in the lime juice and olive oil for 2 hours. In the meantime, mix the chile powder, garlic powder, cayenne and salt and pepper (to taste, if desired). Easiest if this mixture is then put in a bag. Cover the chicken in the spice mixture (can shake in the bag if using one) - add more spices if necessary to cover. Grill or bake the chicken breasts until cooked. Best if can barbecue! Cut in thin slices and put to side. To make each fajita, place the chicken slices on the tortilla and garnish with the onion, peppers, corn, salsa and shredded cheese. Roll the tortilla into a cone and serve. Accompany with guacamole, quarters of lime and cilantro, if desired.