1 cup of flour
1/2 teaspoon of salt
1 level teaspoon baking powder
Whisk together very well and sift the mixture. Measure your self-rising flour from there.
Note from Smitten Kitchen: There are many recipes for making your own self rsking flour and they don?t all agree. The most common one has you add for each cup of flour 1/2 teaspoon of salt and 1 1/2 teaspoons baking powder but some also suggest 1 teaspoon baking powder instead. The author suggest for every cup of flour, add a 1/2 teaspoon of salt and 1 teaspoon of baking powder,