Your best option is to call Customer Service so that they can assess the situation to determine the optimal solution. Under normal circumstances, if you are making a half batch and the fudge looks soupy, let the kettle run longer than usual with the motor and heat on. The extra moisture will dissipate.
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To get your login immediately, call 855-289-8399, Monday through Friday, from 8:05 AM to 5:50 PM (Eastern Fudge Time) and ask for Customer Service.