"Who Stole the Cookie from the Cookie Jar?" is a never-ending children's song in which each verse loops into the next.
Cookie Monster, Elmo, and Abby Cadabby sang a version of the song in a video originally shared to Sesame Street's YouTube channel in August 2018. (YouTube)
The video was later featured in the My Sesame Street Friends episode "My Sesame Music: Cookies," and has been re-uploaded to the YouTube channel with sing along captions (YouTube) and with ASL interpreters. (YouTube)
Cookie, Elmo, Abby, and Ernie later covered the song (now as "Who Stole the Cookie from Cookie Monster?") as a part of a "Cookie Monster songs" medley in a 2023 Best Friends Band video.