I made this last night so I changed the recipe around a little bit to reflect what I actually did. Also, the entire stick of butter at the very end made the soup really velvety and wonderful. When you think about it, the soup makes like 12 bowls, so that's only a little more than 1/2 tablespoon of butter in each bowl, so don't be afraid. Also, I think the potatoes aren't really necessary. They make the soup thicker, definitely, but their texture against the pasta leaves a little to be desired.

If anyone wants me to fedex them a bowl, ezmessage me your address.