cookie sheet
US /ˈkʊk.i ˌʃiːt/
UK /ˈkʊk.i ˌʃiːt/

1.
a flat metal tray on which cookies or other food are baked
:
•
She placed the dough on the cookie sheet and put it in the oven.
•
Make sure to grease the cookie sheet before baking.
a flat metal tray on which cookies or other food are baked