Handful of Crumbs (found "Sesame Street" short; 1982)
From The Lost Media Wiki
Handful of Crumbs was a Sesame Street song that first aired sometime in Season 14 of Sesame Street. It featured Cookie Monster singing how he is sad that his cookie broke into crumbs, with a country band of Sesame Street monsters, including one who would become Elmo (performed by Jerry Nelson). At the song's conclusion, Cookie has an idea: eat the crumbs!
There are no known copies or screenshots of this short available online. But the remade audio was released on Put Down the Duckie, C is for Cookie, and Elmo's Lowdown Hoedown. The clip made reruns into the 1980s, but the short hasn't been aired since.