I made some cupcakes this morning that I intend to frost with a batch of buttercream I made yesterday, it is in the fridge. Should I bring it back up to room temp before frosting with it or is straight out of the fridge ok ?
at fridge temp will be stiff!!!! and therefore hard to pipe.
a cheat I use is to toss it in KA and beat a bit to get back to near room temp
good idea to "fluff" again before using if it has sat that long.
(tho' w/ my hot hands....not to near, need it a bit on the still chilly side)
Usually my buttercream is quite hard when it has been in the fridge. I suggest taking it out of the fridge and leaving it out for a couple of hours to warm up. Then, like Doug said, either mix it up again in your mixer or just use a rubber spatula and mix it up vigorously to get it to a fluffy consistency again.
Thanks for the tips, I left it out for a bit and then tossed it back in the mixer. It worked great! 
Quote by @%username% on %date%
%body%