Look at the “best before” date when buying baking powder to make sure it is fresh and will offer the best rising power. • When using a Royal Baking Powder sachet or refill, place unused baking powder ...

And often, the culprit hides in a discreet little sachet at the back of the cupboard ... you'll never look at yeast in the same way again;) 1. Baking powder or baker's yeast?