floral square cake, Square Fiesta Cake, Square rocks Square Cake Layers – Vanilla Butter recipe. 15cmx15cmx4cm / 6″x6″x1.5″ April 5, 2019 / Save as PDF Quantity per student: 4 frozen and flat layers. Not allowed: Oil based cakes. Or sponge cakes. The cake used must be dense. Butter based like Pound Cake.