A cinnamon bun consists of a rolled sheet of yeast-leavened dough onto which a cinnamon and sugar mixture (and raisins or other ingredients in some cases) is sprinkled over a thin coat of butter. The dough is then rolled, cut into individual portions, and baked or deep fried. Its main ingredients are flour, cinnamon, sugar, and butter, which provide a robust and sweet flavour. More info here!