Put the eggs, yoghurt, oil and feta cheese in a bowl and stir until you get a homogeneous mixture.
Smear the sheets with the resulting mixture, making sure to distribute it evenly among all of them.
Roll up the sheets lengthwise and arrange them in a circle in a pre-buttered oven dish.
Pour the rest of the butter and milk onto the spiraled phyllo pastry.
Bake at 356°F (180 °C) for 40 min.
Take it out, sprinkle with water and smother it with a towel.