If your baked goods need refrigeration, make sure your name and character card number are written on it legibly, that you're the only person taking it out of the fridge and most importantly, that you ask one of the Kitchen Marshals if you can put something in there.
Otherwise, here are the rules for selling goods, baked or otherwise:
Presumably what you'll be selling is worth less than $10 and can be for either in-game currency (gold/silver) or "Baronial Notes." Follow the above rules and you're golden.
Hoping to be a customer in the future,
Jeff