I've just finished my packet of baking powder. This is good one one hand (means I've been baking - I've been experimenting with biscuits with varying degrees of success) not so good on the other (I want to bake but don't want to go and buy any!)
So, what can I do?
I have some Cream of Tartar (from making play dough and a meringue icing) and also have Bicarb (doesn't everyone?) After a little bit of research on the internet, I have discovered that it is really simple.
1 part Bicarb : 2 parts Cream of Tartar
ie when 1 teaspoon is needed
1/4 tspn Bicarb + 1/2 tspn Cream of Tartar.
No, that doesn't equal 1 tspn, but commercial baking powder then has cornflour added to allow it to flow.
Happy baking days ahead!