Ingredients

• ¼ cup butter
• 1 large onion – diced
• 2 cloves garlic – minced
• ¼ cup flour
• 2 cups whole milk
• 1 cup chicken broth
• ½ teaspoon kosher salt
• ¼ teaspoon pepper
• 3 lbs potatoes – sliced about ⅛” thick

Instructions

Sauce

1. Preheat the oven to 350˚F.
2. Melt the butter over medium low heat. Add the onion and garlic and continue to cook until it is softened.
3. Add the flour and cook for 1-2 minutes. 
4. Reduce heat to low and add the milk and broth a little at a time, whisking to prevent lumps. As the mixture begins to reach the boil, it will thicken.
5. Stir in salt and pepper and heat an additional minute.

Potatoes

• Butter a 9″x13″ baking dish.
• Layer in a third of the potato slices and season them with with salt and pepper.
• Pour a third of the cream sauce sauce over that layer. 
• Repeat layers finishing with a layer of cream sauce. 
• Cover and bake for 45 minutes.
• Uncover and bake for an additional 35-45 minutes until golden brown and potatoes are tender when a knife is inserted.
• Broil for 3-4 minutes to obtain a golden top.
• Allow to rest for 10-15 minutes before serving.