Oooops sorry I forgot to post a link to the recipe. Just switch out the chocolate to white chocolate.
http://cakecentral.com/recipes/4953/chocolate-ganache-iii
Typically a spreadable is just good coverture choc, at a 2:1 ratio of choc to cream for dark choc, and a 3:1 for white. It's all adjustable, you can play with it. No butter required or corn syrups, it's just heating the cream to a boil, and pour over the chopped up choc. Stir gently until it's all incorporated, and leave it alone overnight or at least part of a day, until it's set. Should be the consistency of peanut butter. Pretty simple.
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