Definitely Mounds or Almond Joy. I think they are the closest I can get to Girls Scout Samoas (Caramel Delights to those on the west coast), at any time of the year.
I am also a big fan of Reese's. They remind me of being a little kid. I used to poke the middle out, then try to peel every bit of the remaining peanut butter out. That way I was left with a solid chocolate ring to enjoy. (I know, I know. I'm weird. Judge me if you must)