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French Onion Potatoes Au Gratin
Ingredients
  • 4 Tbsp. salted butter, plus more for the baking dish
  • 2 Tbsp olive oil
  • 5 onions, thinly sliced
  • 1½ tsp kosher salt
  • Black pepper, to taste
  • 1 tsp sugar
  • 1 Tbsp fresh thyme, chopped
  • ¼ cup dry sherry
  • ½ cup low-sodium beef broth
  • 2 Tbsp all-purpose flour
  • 1½ cups heavy cream
  • 1½ cups whole milk
  • ¼ tsp freshly grated nutmeg
  • 6 oz. gruyere cheese, shredded
  • 6 oz. swiss cheese, shredded
  • 5 large russet potatoes, peeled, halved and sliced ¼" thick
  • ¼ cup grated parmesan cheese
  • Chopped fresh chives, for topping
Note: Ingredients may have been altered from the original.
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