Conspiracy Theories is cross-listed as HIS 298 and ART 298
On March 1 2021, NPR began an ongoing series called Untangling Disinformation. It's about disinformation generally, including conspiracy theories. The most recent installment discusses a new HBO documentary about QAnon.
The Shadowland series from The Atlantic began in 2020 and is ongoing.
The Media Manipulation Casebook is apparently not ongoing but a very interesting set of case studies with icons for different forms of manipulation. Topics include a few conspiracy theories.
*r/conspiracy has recently seen an influx of far right-wing enthusiasts and the tone and content have changed.