vanilla is a crowd pleasing flavour while Oreo’s are world’s best selling cookies. [Refer] So when I saw orange flavoured oreo’s in the market, I knew they had to find a way to be baked in a cake. Sheet cakes are basically cakes made in a tray. You can serve the cake from the tray itself most of the times. They may or may not have a frosting. This cake is prefect for sending to school, make ahead for guests, for a picnic or even an edible gift.