@jswc - I wouldn't sub cream of tartar in. That would be a LOT of cream of tartar, and I strongly suspect it would make the biscuits taste vile. (I accidentally switched the measurements of baking powder and cream of tartar in my biscuit recipe once, because I was in an unfamiliar kitchen and the containers were the opposite size ratio from what I'm used to. They were horrible, sour and bitter and almost rancid tasting.) My recipe seems to be about half as big as this one, with only two cups of flour to 1Tbsp baking powder 1/2 tsp cream of tartar, but I wouldn't risk it. Inedible biscuits are really disappointing.

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