a sweet biscuit having a fairly soft, chewy texture and typically containing pieces of chocolate or fruit

chocolate chip cookies

a person of a specified kind

she's a tough cookie

a packet of data sent by a web server to a browser, which is returned by the browser each time it subsequently accesses the same server, used to identify the user or track their access to the server

a plain bun

A nickname for: a cook.

Now usually in form cookee. A cook's assistant in a camp, especially a logging camp.