Rebecca Ferrell and and Holly Dunsworth held a panel/workshop at this past year's AAPAs on Broader Impacts:

http://physanth.org/annual-meetings/past-meetings/88th-annual-meeting-2019/workshops-and-other-events-88th-annual-aapa-meeting-cleveland-ohio/understanding-nsf-broader-impacts-criterion-and-developing-societal-impact-your-science/

They developed a handout with many useful resources:

AAPA_NSF_Broader_Impacts_Workshop_Handout.pdf