Make French Onion Potatoes Au Gratin This Thanksgiving
"These creamy potatoes are layered with caramelized onions and lots of cheese!..."
INGREDIENTS
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4 tbsp. salted butter, plus more for the baking dish
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2 tbsp. olive oil
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5 onions, thinly sliced
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1 1/2 tsp. kosher salt
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Black pepper, to taste
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1 tsp. sugar
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1 tbsp. fresh thyme, chopped
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1/4 c. dry sherry
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1/2 c. low-sodium beef broth
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2 tbsp. all-purpose flour
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1 1/2 c. heavy cream
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1/4 tsp. freshly grated nutmeg
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6 oz. gruyere cheese, shredded
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6 oz. swiss cheese, shredded
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5 large russet potatoes, peeled, halved and sliced 1/4 inch thick
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1/4 c. grated parmesan cheese
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Chopped fresh chives, for topping
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