I recently participated in an excellent webinar about ways to improve critical thinking for middle schoolers. The webinar was only an hour long, but well organized. The provided an interesting example using ways to get kids to explore unfamiliar concepts in literature through questioning. I enjoyed the presentation because it felt really empowering to students and allowed them to discover more than get lectured at.
The webinar was presented by AmplyELA, and I’d encourage you to check out their other webinars, I certainly will. (Some are free, some are paid.)