They are usually made of wheat, barley or oatmeal, with baking powder as a leavening agent, and are baked on sheet pans.
Sheet pans may be coated with a glaze to prevent food from sticking to their surface.
When purchased with a glaze, sheet pans are often straightened and/or re-coated with glaze.
A half sheet pan is 18by13in cm; quarter sheets are 9by13in cm.
A thin cake layer is made of flour, eggs, and sugar and baked in a very shallow rectangular baking tray, called a sheet pan.
The full-size sheet pan is 26by18in cm, which is too large for most home ovens.
The most basic sheet pan is literally a sheet of metal.
