Tatsu's cookie.... hm... I think was mostly inspired by the phrase "I hassa cookie!" but also because Bao Bao would have bamboo... I know we wanted something to take place of a dragon's pearl, anyway. In Eastern art, a dragon is often shown holding a pearl (of wisdom, generally) in his/her claw. So I think the general idea was Tatsu's too young (and mischievous) to have wisdom... so he hassa cookie! Which is also round. XD

That makes no sense when you write it out like that. LOL. It wasn't a linear thought process, really. >_>;

As for what kind of cookie... Almost all the best cookies have chocolate in them. :o