خبز الصمون (خبز بحليب pain au lait)
warm milk (about 480 ml) • (about 1 1/2 tablespoons) butter • vegetable oil • large egg, at room temperature • salt • instant yeast • sugar • mahlab (optional) • white vinegar • powdered milk • (about 8 cups) all-purpose flour, or as needed • large egg, at room temperature •