Cream soup is also good, I know there are lots of recipes on the internet. Maybe I'll try it out once, but make it only half creamy :)
You can use sour cream, instead of milk and flour, or whipping cream, but I find whipping cream too heavy for my gallbladder and if you had an ultrasound, then you should not use it either.
I hope everything is ok with your gallbladder :)
I prefer half-creamy too. Even if it is not indicated for the gallbladder, we frequently use sour cream. My wife is from Ardeal. My gallbladder is relatively fine but it has an irregular shape or position, since birth, and I often have pains that the doctor told me to get used to.