Add sugar, water and yeast to bowl. Mix well. Let sit 5-10 minutes until frothy. Mix in the oil, yogurt and egg.
Mix 1 cup flour and salt. Add liquids and mix. Continue adding flour and combine, until you can no longer stir the mixture.
Turn out onto floured surface and knead in remaining flour until it is smooth but not sticky. Add additional flour if neccessary. Cover and rise for 1 hour, or until doubled.
Divide into 8 pieces. Roll each piece flat (1/4" or less). Fry in hot skillet, flipping when large bubbles have formed.