I live outside the U.S., where buttermilk powder is unheard of. Buttermilk, on the other hand, is a standard supermarket item here. Out of curiosity, I picked up a few packets of buttermilk powder on my last trip to the U.S. I used some this morning in the waffle recipe from the last issue of Cooks Illustrated, where instead of buttermilk they use buttermilk powder and soda water to give the waffles more lift (came out great).
My question is, are there uses for buttermilk powder other than as a substitute for real buttermilk (like in CI waffle recipe)? I don't want to waste my precious stash on recipes where buttermilk will do just as well.