Majo no Soup

Eld Elflame, a witch who descended to Earth to save the demon world from crisis, is skilled at making soup and plots to annihilate humanity with her ultimate "poisoned soup." However, she accidentally tastes soup from the human world and is captivated by its otherworldly deliciousness!? A full-fledged cooking fantasy!

(Source: Shonen Gahosha, translated)