Boil the chicken in water until done, about 5-10 minutes. Drain off the water, and when the chicken is cool, cut into small pieces. Melt the butter in a skillet and add onions and peppers. Sauté until done. Add chicken, soup, salsa, Worcestershire sauce, salt and pepper. On a baking sheet, arrange 5 of the tortillas and top with the soup mixture. Place the other tortillas on top of the soup mixture and brush with butter. Bake at 325 degrees for about 5 minutes.