Maoujou no Ryouriban: Kowamote Mazoku Bakari dakedo, White na Shokuba desu

Tsumugi, a human who works in the cafeteria of the Demon King's castle, is actually an isekai transmigrator. Formerly a homeless woman on the brink of death in her original world, she stubbornly defends her dream life, which guarantees food, clothing, and shelter, not to be outdone by the boorish and fierce-looking demons...!? A gourmet isekai love comedy set in the Demon King's castle.

(Source: Shinchosha, translated)