I only know that the mc is poor, but also really good at cooking it's in a historical timeline and the seme is royalty
I know there's an arc in QWFOD with similar settings, but I don't think it's what you're searching for. Does the seme have amnesia?
I can only think of Palace full of delicacies at the moment. It's about a transmigrated seafood cook to a poor noble meeting with Kitty Emperor ML