I have done many rose cakes, but not a sheet cake with just the top covered.
Cakes | Bake It So
Frost square or rectangular cakes on top of a working platform (double strength cardboard works great)
Rectangle Cake with Vanilla Buttercream (Handmade Charlotte)
Smooth chocolate and vanilla buttercream recipes, videos on how to make buttercream and frost cakes including cylinder, square or rectangle cakes, plus how to pipe a buttercream dot cascade design
Rectangle Cake with Vanilla Buttercream Recipe