Add the whisked eggs and sour cream to the feta cheese and mix everything.
Reserve two tablespoons of milk for later and add all the rest of the milk to the eggs-sour cream-feta mixture, mixing everything together.
Melt the butter in a small microwaveable bowl or in a pan on low heat on the stove.
Using a pastry brush, butter a baking dish.
Put two filo sheets on the bottom and add melted butter with a pastry brush on each.
Now, we’ll take 4 filo sheets and bunch them up on the long side and add them to the baking dish, side by side, sprinkling melted butter on top of them with a pastry brush or spoon.
Add half the cheese-sour-cream-milk mixture.
Add 4 ruffled/bunched-up filo sheets on top, and add melted butter.
Pour the second half of the cheese-sour-cream-milk mixture.
Add 2 sheets on top and add melted butter with a pastry brush on each.
Mix an egg yolk with the reserved 2 tbsp of milk, and top the borek with this mixture.
(Optional) Sprinkle the nigella seeds on top.
Bake the borek in the preheated oven at 360°F or 180°C for 50-60 minutes until golden. Once it’s ready, leave it to rest for 5 minutes, cut yourself a slice and enjoy it warm.
Recipe Notes
If choosing to microwave the butter, heat it up in 10-second increments so that the butter doesn’t splatter in the microwave. After every 10 seconds, pull the bowl out of the microwave and stir. Some microwaves may also have a melt-butter function, which should make things easier.