Selam.... Merhaba from Türkiye.. 👋
We call this dızmana (read;desh-mana), dizman or dıclama. But mostly people just named it göçmen böreği.
İt's not really like pastry you probably know which made from thin layers of phyllo dough or puff pastry or flaky dough pastry.
İt's a pastry dish, bread-like pour with yogurt egg sauce then bake.
Sometimes fill with cheese or mashed potatoes, but plain without any filling also as good as with filling.
This dızmana is commonly made in Bulgaria by Thracian immigrants. But now everybody across regions also love to bake it.
Also see my other Turkish pastry (börek) in "Börekler" category.