"Dimitri" > wrote in message
. ..
>
> "Scott" > wrote in message
> ...
> >I picked up a copy of Baking 9-1-1 by Sarah Phillips,
> >
<http://www.amazon.com/exec/obidos/tg...id=1126808676/
> > sr=2-1/ref=pd_bbs_b_2_1/002-8697222-1580023?v=glance&s=books>
> >
> > and came across a statement that piqued my interest. In her recipe for
> > sugar cookies, she writes "most cookies use baking powder for leavening;
> > I chose to use baking soda. It causes the cookies to spread rather than
> > puff, perfect for a crispy cookie, and have a wonderful buttery flavor
> > you can't get with baking powder."
> >
> > The ingredients a unbleached AP flour, baking soda (1/2 tsp), baking
> > powder (1/4 tsp), salt, unsalted butter, sugar, an egg, vanilla extract,
> > and an optional 1/2 tsp lemon extract.
>
>
> Butter is acidic.

As is the brown sugar.