Oil grate, mix with flour. Add sour cream ( I added thick yogurt), soda, and salt. Knead the dough. If necessary, the pre-fry (saute) the mushrooms with the chopped onion and cool. I had already cooked. Peel the potatoes and make some very thin - can be a peeler. Grate cheese on a grater. Divide the dough into 2 parts: 1 part to do more. In a baking dish put the dough, forming the sides, and then the filling: 1 tbsp. Mushrooms 2 CL. Sliced raw potatoes and sprinkle it lightly with salt and nutmeg. 3 SL. Cheese is a Smaller part of the dough to cover the filling, seal the edges. Bake the pie at temp. approximately 180 deg. With (but you better adapt to your oven)

Bon appetit!