A scone is a single-serving cake or quick bread. They are usually made of wheat, barley or oatmeal, with baking powder as a leavening agent, and are baked on sheet pans. They are often lightly sweetened and are occasionally glazed with egg wash. The scone is a basic component of the cream tea or Devonshire tea. It differs from a teacake and other sweet buns, which are made with yeast.