Step 1 Sift 2 cups of the flour, the sugar and salt into a large mixing bowl. Make a well in the flour and add the yogurt. Mix with your fingers while adding the milk, one-fourth cup at a time. Use only enough milk to form a soft, pliable dough. Dust with a little of the remaining flour and set aside, covered, for 15 to 20 minutes.
Step 2 Divide the dough into 8 equal parts and roll each into a ball. Dredge in flour and flatten into disks 2 1/2 to 3 inches in diameter. Roll out into thin 8-inch rounds, using flour as needed to keep them from sticking.
Step 3If freezing or refrigerating, layer between pieces of wax paper or parchment and seal tightly in plastic, then in aluminum foil.