Sieve the flour and baking powder together. Place the yogurt, the eggs, olive oil and paprika in a large bowl. Whisk with a whisker till you have a homogeneous mixture. Then add the feta cheese and stir. Add the flour, a little at a time, and continue stirring. Grease with olive oil and dust-flour a shallow baking pan. Empty the mixture in it and smooth it with the back of a spoon.