In a large saucepan combine chicken broth, onion and cauliflower.

Bring mixture to a boil then reduce heat; cover and simmer until cauliflower is tender.

Remove from heat and puree mixture a bit at a time. Set aside in a large bowl.

In the same saucepan, melt the butter. Stir in flour and then add milk.

Cook on medium to high heat, stirring constantly until mixture thickens. Reduce heat to low.

Add pureed vegetable mixture, stir well and heat through.

Enjoy!