Can I substitute buttermilk for milk?

Milk and buttermilk are different in that buttermilk is acidic. Normally, to achieve the best baking results when using buttermilk instead of milk, you substitute baking soda for some or all of the baking powder. For each cup of buttermilk used in place of sweet milk, reduce the amount of baking powder by 2 teaspoons, and replace with ½ teaspoon of baking soda. You might like to keep our Emergency Substitutions Chart handy. Happy Baking!