Taishuu Shokudou Akuyaku Reijou: Konyaku Haki saretanode Shokudou wo Aitara Iyashi no Chikara ga Kaika shimashita

Born into a family of priests, Lydia was ostracized by her family for being born without magical powers, treated as an unwanted child. After her engagement was broken off, she ran away from home and opened a diner called "Lobelia" to start a new life! Traumatized by her painful past, she cooks with resentment and bitterness. But for some reason, Lydia's cooking becomes incredibly popular, with everyone calling it "healing food"!?

(Source: Overlap, translated)