Baking powder, bread soda, yeast or whipped egg whites are all used to add air to baking. Baking powder and bread soda are two widely used ingredients yet people are often confused about the differences. Some recipes call for both baking powder and baking soda. It is best to store both bread soda and baking powder in an airtight container in a cool, dry place. Sieve the baking powder, bread soda, flour and spices together and stir in the caster sugar.

Source: Irish Examiner February 08, 2020 14:48 UTC