Ponkotsu Reijou ni Tenseishitara, Mofumofu kara Ouji no Meshiuma Yome ni Ninmeisaremashita

Asteria, a young lady who died from overwork in her previous life as a chef. As a result of her lessons, she has lived freely in this world, and although she is of the right age, she is not sexy and has made a name for herself as a "prank daughter". However, she ended up making rice for the fluffy sacred beast she met in the royal capital (who has a keen taste for mysteries)! Using the experience of the previous life, Asteria makes exquisite rice that grabs the sacred beast's stomach! On top of that, she was selected as the “meshiuma wife” of a shut-in prince who devoted herself to research…!? Source: MU