mixed egg and bicarbonate of soda I was half way through making a batch of peanut butter cookies when my mixer blew up - not a happy camper.  As I had already mixed my eggs and bicarbonate of soda together, I would like to know if I can store this mixture in the fridge overnight and resume baking tomorrow?
thank you
Perishable food, including raw eggs, is safe in the fridge for a day. So you can do that. 

The soda can spend its leavening power though, especially if you also have other ingredients mixed in. The cookies will not have the same texture as freshly made, and it is hard to say how much difference there will be and where on the spectrum is your limit for "acceptable quality". So, you can go ahead and make them, but be aware that you are facing a significant probability of failure.