butter substitute for cookies?

Kstew b&w
Posted on 06/26/2012 by soup_lover_9
Hi y'all.
I was wondering if I can substitute the butter called for in this recipe with yoghurt. I usually replace butter with yoghurt in cakes, and it turns out fine, but can I do this with cookies? (I live in a small city in China, where butter is hard to come by, but there's plenty of sweetened yoghurt).

Thanks!

Recipe: http://sallysbakingaddiction.com/2012/03/27/peanut-butter-mm-cookies/


ETA: 
I don't have shortening or margarin either. Could I mix some yoghurt with the butter? Or will that be a disaster? 
They have oil here, but not to make this sound bad or anything, but I don't trust it. I've heard rumors about how it's being processed from some of the other foreigners. :/
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