Instructions:
Preheat oven to 350˚F.
Sauce
To make the sauce, melt butter, onion and garlic over medium low heat.
Cook until onion is softened, about 3 minutes. Add flour and cook for 1-2 minutes.
Reduce heat to low. Combine milk and broth. Add a small amount at a time whisking to thicken. The mixture will become very thick, continue adding a little bit of liquid at a time whisking until smooth.
Once all of the liquid has been added, bring to a boil over medium heat while continuing to whisk. Stir in salt and pepper and let boil 1 minute.
Assembly
