How to cook
Beat the butter, add the eggs one by one, then the yogurt with the baking powder pre-dissolved in it. Stir and add the milk, or yogurt, feta cheese, which you've crumbled with a fork, and finally - the flour.
Stir gently and put the mixture into a greased tray. You can grate cheese on top at the end of cooking, if you wish.
Serve the cake warm, cut into small squares.