Dissolve the yeast and sugar in warm milk.
In a bowl, mix the flour with the salt, then slowly add the milk with the yeast and sugar and stir.
Next, dissolve the baking powder in the water and add it to the mixture; add the grated feta, cover the bowl and leave to rest in a warm place for 1 hour.
When you're ready to cook, pour the mixture into baking frames and fry in a buttered pan over medium heat for about 5 minutes, then turn over and cook for 1 more minute. Enjoy!