In medium-sized saucepan, heat the olive oil and saute the onion and garlic until soft.
Add the together the broth, 1/2 cup of the milk, and the seasonings and bring to the boil.
Whisk together the remaining 1 cup of milk and flour and add while whisking the
boiling mixture and continue whisking until mixture boils and thickens.
Cool, and use as directed in your favourite recipe