They still make a buttermilk baking mix.
Stupid question = Stupid answer
No, you can substitute buttermilk for milk but not for baking powder.
Yes, you can use buttermilk with baking powder.
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.
first you have to get some rice and mix it with the baking soda to get goo
Baking soda is already an ingredient of baking powder so by mixing the two you would be simply changing the proportion of baking soda to baking powder. It will make no real difference to the outcome if you make up the volume of raising agent the recipe calls for with any proportion of baking powder to baking soda. As a safeguard you may like to add a teaspoon of white vinegar or a tablespoon of yoghurt or buttermilk to a cupcake recipe made with baking soda - the acid in the vinegar/yoghurt/buttermilk will react with the Soda to release carbon dioxide which will make you cupcakes rise.
I never mix it as I do not
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.
If you mean baking powder, then just mix two parts cream of tartar with one part baking soda.
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.
mix baking soda with vinagar and shake in a soda bottle and let it flyyyyy!!!!!!!!!!!!!