Swiss Onion Quiche

Bahan-bahan (6 porsi)

• One whole baked pie crust
• ¼ cup (½ stick) unsalted butter
• 4 medium sweet onions, (sliced thinly)
• ½ teaspoon salt
• ½ teaspoon freshly ground black pepper
• 1 cup shredded Gruyere (Swiss) cheese
• 2 large eggs
• 2 large egg yolks
• 1½ cups half and half cream
• ⅛ teaspoon ground nutmeg