# Put the yeast powder, warm water and sugar
into a mixing bowl, mix it. Then, cover and rest the mixture 10 minutes.
# At the end of the resting time, add egg white, yogurt
, salt and vegetable oil into the mixture and mix it well.
# Knead the mixture by adding flour
on it little by little. Make it reach soft consistency. Cover and rest it for half an hour at least.
# Divide the rested dough into 12 equal pieces. Roll out each of the pieces into plate size.
# Spread vegetable oil all over the rolled out dough piece, as a thin layer. Then, fold into double. Spread vegetable oil all over the upside of the folded half also.
# Place some of the mixture of grated feta cheese
and finely sliced parsley onto the smooth side of the half as a string. Then roll the yufka. Then, keep one of the ends stabile, and wrap the other one around the stabile one.
# Prepare all the boreks by this way. Get the endings of the rolls downside, while placing them onto the greased baking tray with some spaces between each of the boreks. Rest the boreks on the tray for half an hour.
# Spread yolk all over the boreks, sprinkle sesame also. Bake them in 374 F oven, until they turn into red.
# Serve it hot or tepid.