<human>: How would someone go about accomplishing this goal?
To harden the chocolate on the rainbow cookies after frosting

OPTIONS:
- put the frosted rainbow cookies back in the fridge  and leave them there for an hour or two, until the chocolate hardens
- put the frosted rainbow cookies back in the oven  and leave them there for an hour or two, until the chocolate hardens
<bot>: put the frosted rainbow cookies back in the fridge  and leave them there for an hour or two, until the chocolate hardens