Put the baking soda in the yoghurt, add the beaten eggs, salt and crumbled feta cheese.
Stir well, add the flour until you obtain a soft dough. Cover the prepared dough a bag that you've smeared with oil and return to the fridge for 1 night.
Take it out of the fridge the next day. Smear your hands with oil and tear small balls of dough, stretch them out with your hands into fritters and fry in generous amounts of oil.