A cinnamon bun is a sweet pastry made from a rolled dough that is filled with a mixture of cinnamon, sugar, and often butter. After baking, it is typically topped with a glaze or icing, which adds extra sweetness. Cinnamon buns are popular in many cultures and are often enjoyed as a breakfast item or dessert. These treats are commonly associated with cinnamon, a spice derived from the inner bark of trees from the genus Cinnamomum. They can be found in bakeries and cafes around the world, and variations exist, including those with nuts or raisins added to the filling.