A stupid question, but do buttercreams go bad if left unrefrigerated?
I'm making a birthday cake (vanilla with chocolate buttercream frosting) in a few days and I'm wondering if I make the frosting the night before, but frost and assemble the cake the day of, will the frosting go bad if I leave it unrefrigerated?
The frosting is the type where you cook flour and milk and cocoa powder until thick and then add that to butter and melted chocolate.
Is it better to make the frosting, place it in the fridge and then bring it to room temperature? Or, can I risk it sitting outside without inadvertently giving everybody food poisoning?
I've read that the buttercreams made from icing sugar are safe outside, but I'm not sure about the type that I'm making. Any advice would be appreciated. Thank you!