au gratin

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Covered with bread crumbs and sometimes butter and grated cheese, and then browned in an oven.

from The Century Dictionary.

• With a breaded or browned crust.

from the GNU version of the Collaborative International Dictionary of English.

• (Cookery) With a crust made by browning in the oven, especially by sprinkling with bread crumbs or grated cheese and browning in a broiler.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Covered with a crust of breadcrumbs (and often cheese) then browned under a grill.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective cooked while covered with browned breadcrumbs (and sometimes cheese)