Substituting Greek Yogurt with Buttermilk

Buttermilk will impart a tangier flavor compared to Greek yogurt due to its naturally higher acidity. This can enhance the overall complexity of the flavor profile, making it slightly more sour without increasing sweetness. The tanginess of buttermilk can complement flavors like chocolate, vanilla, and citrus well, though it might overshadow subtler flavors that Greek yogurt would have allowed to shine. The acidity also helps balance sweetness, making it suitable for desserts that could benefit from a slight tartness.