I'd think that drinking any concoction with liquified butter would be horrible. I made my own recipe 5 years ago, it was a real crowd pleaser at my HP club's Halloween Banquet:
*a DASH (YES, I MEAN DASH) of cinnamon
*a tablespoon of sugar (1.5-2 tbsp if you've got a sweet tooth)
* a cup of warmed cream soda
Mix the cinn. and sug. in a cup, then pour the soda on top. The cinnamon adds a kick to it and also causes the soda to bubble and foam. If you add too much, it'll taste too bitter, so use as little as you dare, esp. if you're only making enough for yourself! It also tastes good cold, that's how we served it at the party and everyone loved it.
I'm going to the release party as Angelina Johnson! I'm wearing a white polo with the Gryffindor crest (thanx google!) and a broomstick that has whatever her broomstick is (nimbus?)in Red and gold puff paint. I can't wait, I work at the bookstore until about 3am, and I'll probably be foolish enough to try to stay up and read some chapters, as dead tired as I'll be.