gratin

Gratin (French pronunciation: ​[ɡʁatɛ̃]) is a widespread culinary technique in which an ingredient is topped with a browned crust, often using breadcrumbs, grated cheese, egg and/or butter. Gratin originated in French cuisine and is usually prepared in a shallow dish of some kind. A gratin is baked or cooked under an overhead grill or broiler to form a golden crust on top and is traditionally served in its baking dish. A gratin dish refers to the shallow oven-proof container traditionally used to prepare gratins and similar dishes.

https://en.wikipedia.org/wiki/Gratin