cookie sheetcookie sheet
Cookies on a cookie sheet.
The definition of a cookie sheet is a baking tool consisting of a relatively flat piece of material (usually metal and often with handles) onto which cookies and other items are placed to be cooked in the oven.
An example of a cookie sheet is the silver tray on which you bake your chocolate chip cookies in the oven.
a flat metal pan on which cookies are baked
A baking sheet.