I made some cookies for valentines with antonia74 recipes, and i have icing leftover. this morning when i looked at it, it looked to have separated. I read that this can happen and icing sugar and stiring should fix it. my question is should i use my kitchen aid to mix it or just add some icing sugar and stir it by hand. and should this be done just before i use it again or now. thanks!
Thanks i'll do that, i read that it lasts up to 30 days in the article.
I always put mine back in the KA and remix for close to the whole 10 minutes. The two times I've tried to rush and just stir it back together, the cookies looked great when I finished them, but when the icing dried the texture was off. The icing was almost grainy and crumbly, not smooth like it usually is.
I didn't realize the texture was off until I was at the shower eating one, and luckily everybody else thought they were fine, but I knew they could have been better! 
SO, my vote is to remix it, or at least if you stir it, do a test cookie and let it dry to make sure you're happy with it.
Laura.
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