acidic flavor and thick texture of yogurt is similar to buttermilk, so plain yogurt makes for a good substitute. You can replace buttermilk cup for cup with plain yogurt, but it may work better to ...
Another cultured dairy substitute for buttermilk is yogurt. Yogurt, like buttermilk, has been fermented, in this case by adding "good bacteria," a.k.a. probiotics, to milk. Unlike sour cream ...