For an extra touch of indulgence, drizzle with additional maple syrup before serving. Feel free to substitute other berries, such as raspberries or strawberries, for the blueberries. If you don't have cinnamon swirl bread, use brioche or challah bread and add a sprinkle of cinnamon sugar between the layers. For a crispier top, broil for the last 2-3 minutes, watching carefully to prevent burning.