Dissolve the yeast in warm water. Add to flour and knead until smooth. Cover with damp cloth. Let rise about 2 to 3 hours.
When the dough has risen, add the baking powder, dissolved in ½ tablespoon of cold water first. Knead again for about 5 minutes, until smooth and elastic.
Roll out the dough into a 2 feet square. Sprinkle lightly with oil and salt