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French Onion Casserole
Ingredients
  • Cooking spray
  • 3 tablespoons olive oil
  • 2 large sweet onions, thinly sliced (about 7 cups)
  • 1.50 teaspoon kosher salt, divided
  • 2 teaspoon apple cider vinegar
  • 2.50 cups heavy cream
  • 2 cups unsalted vegetable stock
  • 1 16-oz. pkg. penne rigate or ziti pasta
  • 1.50 tablespoon Worcestershire sauce
  • ⅛ teaspoon ground nutmeg
  • 1 medium clove garlic, grated
  • 12 ounces aged Gruyère cheese, shredded (about 3 cups), divided
  • 4 ounces sharp white Cheddar cheese, shredded (about 1 cup), divided
  • 1 tablespoon fresh thyme leaves
Steps
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