Can you add baking powder to self raising flour when busicuts?

It's not recommended to add baking powder to self-raising flour when making biscuits.

Here's why:

* Self-raising flour already contains baking powder. Adding more will result in an overly-leavened biscuit, which will be crumbly and dry.

* The proportions are specific. Self-raising flour has a specific ratio of baking powder to flour. Adding more will disrupt this balance and could lead to unpredictable results.

If you're making biscuits with self-raising flour, you shouldn't need to add any extra baking powder.

However, if you don't have self-raising flour, you can use plain flour and add your own baking powder to achieve the same result. The amount of baking powder to add will depend on the recipe.