For the corn tortillas, first mix wheat flour with corn flour and salt. Add the egg and gradually enough water to form a firm kneadable dough. Let it rest for 20 minutes.
Then form balls the size of walnuts from the dough and roll them out into 2 mm thick patties or press them thinly with a tortilla press (preferably lined with plastic wrap).
Toast the corn tortillas in an ungreased pan.
The video for the recipe is here.