Cinnamoroll spent days in the kitchen baking up some tasty treats for his best friend’s birthday, and this is one of his absolute favorites! He loves to make castella cake at home—a large, pillowy sponge that’s slightly sweet. But for Hello Kitty’s party, he made this mini version for everyone to enjoy. He can be a bit shy at big events, but everyone will want to come talk to him when he shows up with these miniature delights.