How to cook
Mix the sour cream with the sugar and stir until the sugar melts well. Add the eggs and stir again.
Then add the yoghurt, with the baking soda in it. At the end, add the flour and baking powder. Knead a soft dough. Roll it out, cut it into circles and with a smaller cutter make the round holes in the middle.
Fry in hot oil and sprinkle with powdered sugar.