There are several Buttercream Frostings, and one that has increased in popularity recently is not very well-known. Ermine Buttercream Frosting, a flour-based buttercream, sometimes called Boiled Flour Frosting or Pudding Based.
I dutifully save my butter wrappers in the freezer for when I want to quickly grease a pan for a cake, but sometimes you just need more. You need to grease and flour. Heck, for some cakes you’ll grease, add parchment, then grease and flour!