Why does my cinnamon-raisin swirl bread separate?
Great question. The most common reason cinnamon-raisin swirl bread will separate along the roll is that there's no binder to hold the swirl filling to the dough. Many recipes have you roll out the dough, sprinkle the cinnamon sugar and raisins over it, and roll it up. That's courting disaster. In this recipe, the eggwash you brush on the dough acts as the binder, giving the cinnamon sugar and raisins something to grab on to. The result? A delicate, loopy swirl with no gaps.