I absolutely love this Hershey's Kisses Christmas ad where the Kisses are played like bells in the shape of a Christmas Tree, playing: "We Wish You a Merry Christmas". It's totally cute and brilliant. I think they've been running this one for years at this point.
Here's the cute Christmas chocolate commercial:
https://www.youtube.com/watch?v=4HtSLF4vlrk
Still, even as good as this is, I think my favorite Christmas product TV ad is the one for Corona beer where someone puts Christmas lights in a palm tree. But this one is up there too.
(BTW: I still think Hershey's should make my suggestion of French Kisses: tongue-shaped chocolates. I had a friend in college who was from Paris, and I asked her what they called French kissing in France, and she said: "Kissing, of course!" Good answer.)
http://unconditionedresponse.blogspot.com/2012/11/hersheys-french-kisses.html
