Dough: In a bowl pour the yoghurt, melted butter, salt and eggs and stir. Gradually add the flour and the baking powder making a soft dough. Roll out in small phyllo sheets the size of a baking pan, 1 cm thick. Butter the pan and lay the sheet to spread evenly. In a large bowl, stir the ingredients for the filling, crushing the cheese with a fork. Pour the mixture on the phyllo. Coat with the egg and season with pepper or cinnamon.