Jiu, no. Please don't eat things that have been sitting outside forever. Transmigration via food poisoning has already been done once. No repeats!

The only dangerous things in his desserts and treats are sugar, flour and probably so many glorious calories.

Considering canon I can definitely see Binghe using the half-eaten munchies to interpret Jiu's tastes with striking precision before reloading his doormat, mailbox, steps with all baked goods!