New answers tagged root-beer
Butter Buds may be a good option for you. (http://www.butterbuds.com/home.html) It has a very buttery flavor. It is fat free which means it won't kill your head retention. While I haven't brewed with it, I have brewed with fat free peanut butter powder for my peanut butter chocolate stout and it worked very well. You should be able to find Butter Buds ...
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