They should be ok, it maybe that they wont rise as much as they should. I realised the other day that my baking powder was out of date, but thankfully it was still working fine.
yeah they will still be fine to eat, they just might be a bit flat! much like self-raising flour, it tends to become 'inactive' after a period of time. there is a way to test if it is still working ok, put some in some liquid (cant remember what you put it in!) and if it fizzes it's still good, but if there's nothing it's time to get some new stuff
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