How to make
Clean the spinach / leeks and chop them finely. Mix well with the pre-beaten eggs, crumbled feta cheese, yoghurt, 5 tablespoons of oil and the baking powder.
Cut out a circle from the phyllo pastry sheet, which is to be slightly larger than the diameter of the top of the pan. Divide the rest of the sheet into 3 equal parts. The bottom of the pan should be approximately 8″ (20 cm) in diameter.
Grease the pan and place the large phyllo pastry sheet - the edges need to stick outside of the pan. Smear it on top with more oil or butter. Put the first of the 3 small sheets on it and grease it again. Spread half of the filling, then place the second of the 3 sheets, the remaining filling and top with the 3rd sheet.
Grease the 3rd sheet, wrap it with the edges of the bottom sheet and grease it again. Thus prepared, bake on a heated moderate stove. Once browned on the bottom, flip it over with a plate and bake the top.
Transfer the ready phyllo pastry to a plate, sprinkle it with water and use a towel to smother it.