This is a super late post because I completely forgot to post this last month 😅 got to snag one of the @brotherbird_bakehouse x @chichasanchen.sg collaboration boxes and they had the following flavours:
🥐 Osmanthus Oolong Croissant
🥐 Milk Tea Croissant Bun
🥐 Dong Ding Oolong Croissant
🥐 BB's Original Croissant
🥐 Rocher Croissant
🥐 Mentaiko Prawn Twice Baked

I liked brotherbird's original flavours as usual but I found the tea flavours lacking in the collab ones and it would have been nicer if there were stronger tea flavours in those croissants 😅