au gratin

US /ˌoʊ ˈɡrɑː.tɑːn/
UK /ˌoʊ ˈɡrɑː.tɑːn/
"au gratin" picture
1.

prepared with a browned crust of breadcrumbs and/or grated cheese

:
The potatoes au gratin were a delicious side dish.
She made cauliflower au gratin for dinner.