In a large bowl mix wholemeal, universal flour, baking powder and 1/4 tsp salt. The feta cheese is made of mashed in the home robot or a blender. To this was added the oil, the milk and sugar and stirred to obtain a homogeneous mixture. To this was added the flour mixture and stirred several times to form a dough. Wrap in foil and put in the fridge for 20 minutes. For the filling - the oil is heated in a skillet. Add the leeks and fry until soft. Add mushrooms and cook stirring until tender and they. Allow the mixture to cool. In a separate bowl, break the egg, sour cream, parsley, pepper and salt. They add mushroom mixture and stir until well mixed. Preheat oven to 200 ° C in advance. On a lightly floured surface, roll the dough into a circle with a half inch thick. Carefully take it with a rolling pin and transfer it on a baking tray. Place the filling on the dough leaving the board 5 cm on all sides. Shrink-wrapped it inside on the filling and cover with egg bath. Crumbs bake 25 to 35 minutes or until the dough is golden. Allow to cool for 5 minutes and serve immediately.