YOU SAID:

My cake is so big and chunky but my brothers cake is very small and flat

INTO JAPANESE

私のケーキはとても大きくて分厚いですが、私の兄弟のケーキはとても小さくて平らです

BACK INTO ENGLISH

My cake is very big and thick, but my brother's cake is very small and flat

INTO JAPANESE

私のケーキはとても大きくて厚いですが、私の兄のケーキはとても小さくて平らです

BACK INTO ENGLISH

My cake is very big and thick, but my brother's cake is very small and flat