Pour vinegar or lemon/lime juice into a measuring cup. Add milk to reach the one cup line.
1 tablespoon white/apple cider vinegar OR lemon/lime juice |15 tablespoons milk
Whisk together and let sit for at least 5 minutes before using. Use in place of one cup of buttermilk in a recipe.
Notes
This buttermilk substitute can be stored in an airtight container in the refrigerator for up to a couple weeks, depending on how fresh your milk is. Nutrition facts are for buttermilk made with 2% milk.
Nutrition information is an estimate per serving, calculated using standard ingredients. Actual values may vary based on brands used, measurement methods, and more.