can I substitute plain flour for self-raising flour?

[Indadhanu]

Not bi carb, baking powder Look on the baking powder packet and see how much to add per cup of plain flour

[ShootingStar]

1 cup plain flour, 1 1/2 teaspoons baking powder and 1/2 teaspoon salt will get you self raising flour.

[Visitor7]

You girls are the bestest, thanks

[Asparagus and Lemons]

My baking powder says 1 cup flour to 2 tsp baking powder...
Hope your cupcakes tasted good!