Yogurt diluted with water (Best Option)
3/4 cup plain yogurt + 1/4 cup water per 1 cup buttermilkYogurt contains lactic acid and proteins similar to buttermilk, which help activate baking soda and contribute to the tender texture and slight tang in granola. Diluting yogurt with water adjusts the thickness to match buttermilk's consistency, ensuring even distribution in the mix.
For best results, use plain, unsweetened yogurt and mix thoroughly with water before incorporating. Avoid flavored or sweetened yogurts as they can alter the granola's flavor profile.
This substitute preserves the characteristic tang and moisture balance, producing granola clusters that are crisp yet tender, closely mimicking the original recipe's outcome.