Crafting a delicious potato filling for börek is surprisingly simple and requires only a handful of ingredients, coming together swiftly. Begin by boiling and mashing potatoes, then incorporating them with caramelized onions and a flavorful blend of spices. To enrich both the taste and texture, finely chopped fresh herbs and a splash of milk or yogurt are stirred into the mixture. This savory filling is then used to fill delicate layers of phyllo pastry, which are subsequently baked to a perfect golden crispness in the oven.