burn (something) to a crisp

Translations
сжечь (что-то) до хруста
He forgot the cake in the oven and burned it to a crisp.
Он забыл пирог в духовке и сжег его до хруста.
Definitions
To cook or burn something until it is extremely charred, blackened, or completely destroyed by heat, often to the point of being inedible.