Hi Lauren! So, the cake in the photo does have a second layer of plain buttercream on top of the raspberry buttercream, and it's an optional step. If you want to do this without having to do the upside-down-layer trick, the easiest way to do that will be to let the cake with the raspberry buttercream chill in the fridge until that buttercream is cold and set. Spreading buttercream on buttercream is no easy task, so the easiest way to get an even layer would be to pipe a dam like you did before, chill it, and then pipe the plain buttercream to fill the whole center rather than spreading it. Once it's piped you can smooth the top over gently and pop the next cake layer on top. Hope this helps! Annabelle@KAF

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