the.com/buttercake

A cake that quit pretending anything else mattered besides butter.

means A simple, dense cake whose flavor comes almost entirely from a generous quantity of butter rather than fruit, spice, or frosting.

from A plain compound of 'butter' plus 'cake' — no hidden story here. It names itself the way a lot of old home-baking did: by its main ingredient, the way we got johnnycake or poundcake (the latter literally a pound each of butter, sugar, eggs, and flour). The term shows up in Southern U.S. baking traditions for a rich, buttery sheet cake, often with a sweet glaze poured on top while warm.

origin
Southern US dessert, named with zero poetic ambition
ratio flex
Often a full pound of butter per cake
texture
Dense enough to feel like a hug with crumbs
frosting status
Optional, because the cake is already the icing
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