For the dough, mix the flour with the salt and baking powder.
Add the egg, pour the milk and oil, mix and knead for 7-10 minutes.
Cover with a towel and let it rest for 30 minutes.
Divide into 6 equal pieces,
shape into small balls.
In a bowl, mix the cornstarch with the flour.
Sprinkle the work surface with the starch mixture and roll out each ball to a thickness of 1-2 mm.
(continue with all the small balls, overlapping the dough sheets one over the other, pressing with the flour and starch mixture)
Roll out the pastry sheets very thinly.
For the filling, mix: eggs, add cottage cheese, feta cheese, sour cream, pour in melted butter and add baking soda. Mix everything very well.
Brush each sheet of dough with melted butter, add the filling here and there, and roll it up.
Transfer the rolls into a buttered pan.
Brush the surface of the pie with the remaining melted butter and bake for 35 minutes at 180 °C.
