Soak three tortillas in the sauce, one at a time, for a few seconds, fill them with shredded chicken, sprinkle the meat with some of the sauce, roll them and place them seam side down on a pasta bowl. Spoon a generous amount of sauce over them and top them with lettuce, cilantro, crema, and cotija cheese. Pour a little more sauce over the whole thing if desired. Repeat the procedure twice more. Serve immediately.