In a small bowl, mix the yeast, sugar and a little water and leave it to rise. Mix with the yoghurt and part of the sifted flour.
Add the oil, salt and water. Continue with the flour. Knead a soft dough. Leave it in a warm area in a covered bowl for 40 min.
Once the dough rises, rip it into small balls about the size of a tennis ball. Roll them out thinly with a rolling pin or with your hands. Use flour to help you.
Sprinkle the crumbled feta cheese on top and pour drops of olive oil on top. Wrap them into a roll and then into a circle with a knot. Roll them out thinly once again.
Bake on both sides in a Teflon pan until ready. To this for all the balls of dough.
You can eat this flatbread on its own as a snack or as a substitute for your usual bread.