Tom Sura at West Virginia University posted a piece the other day about the "one-minute paper." It's a classroom assessment technique that asks students to process the day's learning and writing a brief note to the teacher about what they're taking away from that class.
There are various approaches to this technique. The prompt can be broad and open, or more narrow and targeted.
I used to employ this practice weekly. Learned a lot from students through this simple exercise. For some reason, I got away from it. Going to pick it up again.