⭐ Plain Yogurt (Thinned with Water) (Best Gluten-Free Option)
3/4 cup plain yogurt + 1/4 cup water per 1 cup buttermilkPlain yogurt contains lactic acid similar to buttermilk, which helps tenderize the dough and support fermentation. Thinning it with water adjusts the viscosity to better match buttermilk, ensuring proper hydration and dough handling.
Ensure the yogurt is plain and unsweetened to avoid off-flavors. Mix thoroughly to avoid lumps and incorporate evenly.
This substitute yields a slightly tangier flavor and a denser crumb compared to buttermilk, but is generally well-suited for sourdough bread.