Put the flour in a bowl and make a well in the middle. Add oil, milk, lukewarm tap water, 1 egg, the dry yeast and salt. Knead by hand and, if necessary, add up to 200 g of flour. The result is a smooth dough. Let the dough rise for about half an hour.
Shape the dough into 20 balls, flatten each ball to a thickness of about 1 cm, add a piece of feta cheese and place the dough over it so that crescent moons are formed. Brush with egg yolk and bake for approx. 20 minutes at 200 ° C.