15 ganache fondant, Uncategorized Round Cake Layers – Vanilla Butter recipe. 15cmx4cm / 6″x1.5″ by 3 layers February 5, 2020 / Save as PDF Quantity per student: 3 chilled and flat layers. Not allowed: Oil based cakes. Or sponge cakes. The cake used must be dense. Butter based like Pound Cake.