It's a Wonderful Tiny Toons Christmas Special (1992)
The Tiny Toons Christmas Special is okay, but not great by any metric. It's cute, not smart. The story is completely straightforward: a passable riff on It's a Wonderful Life.
Where it really fell flat for me was an excess of jokes based on parodying celebrities. I didn't get these jokes back in 1992, and now they're really dated.
That said, there was a good bit of the meta-humor that Tiny Toons was known for, all based on the awareness of being in a cartoon. The visual of Buster thinking of throwing himself "out of the cartoon" is particularly nice. His rabbity angel is named Harvey.
If you're after specials from cartoons you may have watched in the 90's and you can't find any Animaniacs, or you still think Cher jokes are funny, this might warm the cockles of your heart. If not, stick around, I'm sure I can recommend something more timeless.
Want to see it anyway? Try YouTube, or it looks like it's available on the Tiny Toon Adventures: Season 1, Vol. 2 DVD set.