Quiche with Gluten-Free Sweet Potato Crust

Ingredients

• Crust
• Nonstick spray
• 2 large sweet potatoes, peeled and sliced into ¼-inch-thick rounds
• 1 tablespoon extra-virgin olive oil
• Filling
• 2 tablespoons extra-virgin olive oil
• 2 leeks, halved and thinly sliced
• 1 large bunch kale, ribs removed and leaves roughly torn
• Kosher salt and freshly ground black pepper
• 1 cup grated Emmentaler or Gruyère cheese, divided
• 5 large eggs
• ¾ cup half-and-half or heavy cream
• ¼ teaspoon ground nutmeg