Boil the vegetable broth to a boil in a large pan.
In a bowl, whisk together the milk and the flour until the flour is dissolved.
Add in the remaining ingredients and continue whisking it until it is incorporated.
Add the milk/flour mixture to the broth, whisking it to combine.
Reduce heat to medium, allow to cook until thickened (3-5 minutes) stirring constantly.
Remove from heat.
Use immediately or store in airtight container in refrigerator.