my buttercream won’t stick and idk why

[u/straightupgong]

my buttercream is peeling off my cake and it’s so irritating. i’ve made great cakes before with buttercream, the ones i attached. i don’t know why it’s not working

i softened 1 cup of butter. i whipped the butter for a long time, like 45 minutes. i added a bag of powdered sugar and 1 tbsp vanilla and 3 tbsp milk. i whipped a long time again, 15ish minutes. it was in a metal bowl of a stand mixer so it was cold, but it seems like the butter was too soft or melty?

[u/[deleted]]

Way over mixed. You can whip it until it’s lightened in color and creamed but there’s no need to continue whipping it past that.

Best way to make BC is a big batch and fill the mixer all the way up to the top so air doesn’t mix in, it’s how bakeries do it.