In small saucepan, over medium heat, melt 3 tbsp butter. Sprinkle with the flour and stir vigorously for several seconds. Slowly whisk the milk into the butter-flour mixture, ensuring there are no lumps. Stir mixture until it thickens then pour it into the pureed vegetables. Heat soup over medium heat but do not boil. Add the cheeses and stir until cheeses are melted. If soup is thicker than desired, add additional milk, small amounts at a time, to thin it to desired consistency. Lastly, add the parsley. Soup freezes well. Garnish as desired.
To make this soup lactose-free, use lactose-free butter, milk, and cheese. To make the soup gluten-free, use same amount of gluten-free 1-to-1 flour to thicken the soup and ensure all other ingredients called for in the recipe are gluten free.
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