I used this in a Bleberry muffins CopyCat Junior's "Berries on Top" Jumbo Blueberry Muffins Came out great!
I usually just substitute straight soymilk for buttermilk in recipes. Today I ran into this recipe from a comment on the recipe I was trying so I was excited to try it out. I'm not sure that it really changed the flavor or texture of the milk though so I'm not sure I will adopt this technique.
Awesome awesome!! :D
Worked great in my "buttermilk" pancakes! Thanks!