Cinnamon Swirl Banana Bread. Mix 1/3 cup sugar and 1 tablespoon cinnamon together. Pour 1/2 of the batter into the loaf pan and then sprinkle half, or a little more than half of the cinnamon-sugar mixture all over the batter in the pan. Add the rest of the batter, and then sprinkle the leftover cinnamon-sugar on top. Bake, and there you are!