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No, you can substitute buttermilk for milk but not for baking powder.
Yes, you can use buttermilk with baking powder.
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You can most definitely use buttermilk for scalloped potatoes. It will give them a nice flavor. I suggest adding some fresh Rosemary to complement the twang of the buttermilk.
They still make a buttermilk baking mix.
buttermilk can last two weeks, but if it is opened it is best to use on the first week. although even after the expiration date you can still using for baking.
Yes. However, if you use baking soda instead of powder, you'll need to include some acid. A teaspoon of lemon juice or using buttermilk instead of regular milk will work.
Buttermilk is actually an acid base. (vinegar+milk). If you use them interchangeably you may create an awesome science experiment (baking soda/powder) but not a Yummy cake!
it makes it more acidic, using buttermilk isn't critical, you can just use ordinary milk but if you want a substitute you could always use milk and a little bit of vinegar.
Buttermilk has a different acidity than whole milk. If used in a cake mix that calls for whole or 2% milk, a teaspoon of baking soda should be added to balance the acid in the buttermilk.
For 1 teaspoon baking soda you can substitute 1/4 teaspoon baking powder plus 1/2 cup sour milk or buttermilk to replace 1/2 cup of liquid called for in your recipe.
I have used kefir as a straight substitute for commercial buttermilk in making cakes and biscuits - without any problems. I do not know the chemical differences/siimilarities, though.