FOR THE DOUGH: Mix the flour, sugar, shortening, and chili powder in a blender. When the dough starts to thicken add the water and egg yolks. The dough will be come very firm. Knead the dough until it is well blended. Then roll out the dough and cut into rounds (like tortillas) that are about 1/4 an inch thick and about 10 centimeters across).