I am making something called "Vanilla Bean Yogurt Panna Cotta" which I had for breakfast at a Hyatt resort. It is pretty decadent for breakfast and includes milk, cream sugar, gelatin, vanilla bean and a tablespoon of "yogurt powder", which I am having a hard time finding in a grocery store. I tried a health food store but they only have yogurt starter. I think the purpose of it is to add a little tang, so I'm wondering if anyone can think of a substitution if I can't get my hands on any before this weekend. Thanks!