Hi Penny! The most requested flavor for cakes and cupcakes for me are mocha and red velvet covered in fondant. I make cakes more for kids. Sometimes they show me the picture of the cake then I will just modify it. I'm from the Philippines.
my most requested is carrot with the cream cheese frosting and my melt in your mouth chocolate cake. I haven't been doing this very long but those are the most frequently asked for cakes.