Sift the flour with the baking powder in a bowl. Add the crumbled feta cheese and stir well.
In a separate bowl, beat 2 eggs with the oil using a fork (result is a runny mayonnaise-like mixture). Add the yoghurt and stir.
Pour the mixture into the bowl with the flour and stir with a fork several times until all ingredients mix. Pour it into a cake form that you've oiled and sprinkled with flour beforehand.
Bake in a preheated 392°F (200 °C) oven about 25 min. or until it's ready.