The learning Activity Portfolio.
I regularly draw on some of the work of critical educator Dr. Stephen Brookfield. He has a wealth of resources on his website and many published books.
He has an activity developed and adapted from other educators called “Chalk Talk”. It is lesson 13 in this linked PDF. This exercise can be adapted to online courses.
Another resource I’ve utilized is the “Helping Adults Learn” resource.
And an excellent paper about “Teaching our own racism“