Potato-Leek Gratin

This came from Williams-Sonoma. It was made by my daughter for Christmas dinner and enjoyed by everyone in attendance. YUM!

• Ready In: 2 hrs 15 mins
• Serves: 8-10

Ingredients

• 5  tablespoons unsalted butter
• 4  lbs leeks, white and light green portions, rinsed well, cut into 1/4-inch rings
• 1 1⁄2 tablespoons kosher salt
• 1  teaspoon  minced fresh thyme
• 1⁄4 teaspoon  freshly grated nutmeg
• 3⁄4 teaspoon fresh ground pepper
• 1  cup heavy cream
• 6  ounces gruyere cheese, grated
• 3  ounces  parmigiano-teggiano cheese, grated
• 3  lbs russet potatoes, peeled, cut into 1/4-inch slices
• 3  tablespoons  minced fresh chives

Directions

1. In 12" nonstick fry pan over medium heat, melt 4 Tbs. butter. Add leeks and salt, stirring to coat leeks with butter. Cover and cook, stirring occasionally, until leeks are tender, about 20 minutes.
2. Add thyme, nutmeg, pepper, and cream. Simmer, uncovered, stirring occasionally, until thickened, about 15 minutes. Transfer to bowl. Let cool. Wipe out pan, grease, with 1 Tbs. butter.
3. Preheat oven to 400 degrees F.
4. In bowl, combine cheeses. Layer one-third of potatoes in fry pan. Spread one-third of leek mixture on top. Sprinkle with one-third of cheeses, then
5. 1 Tbs. chives. Repeat layering, two more times, reserving 1 Tbs. chives. Cover pan; transfer to oven. Bake 45 minutes. Remove lid and bake until potatoes are tender and crust is golden brown, about 30 minutes more.
6. Sprinkle remaining chives on top. Let stand 15 minutes before serving.