1 prepared pie crust
2 tbsp. unsalted butter
1 lb. leeks (including tender green parts), sliced crosswise
1/8-inch thick
Salt and pepper, freshly ground
4 whole eggs, plus 2 egg yolks
1 ½ to 2 cups heavy cream, light cream, or half-and-half
Pinch of nutmeg, freshly ground
1 c. Gruyère, Emmenthaler, or Jarlsberg cheese, shredded
3 tbsp. fresh chives, chopped
¼ lb. fresh goat cheese, crumbled
Directions
In a large, heavy frying pan, melt the butter over medium-low heat. When it foams, add the leeks, reduce the heat to low, and cook slowly until the leeks are soft and golden, about 15 minutes. Season with salt and pepper. Position a rack in the upper third of the oven and preheat the oven to 350 degrees. Place a baking sheet on the rack below to catch drips.
In a bowl, whisk together the whole egg, egg yolk and cream until well blended. Season with the nutmeg, salt, and pepper. Sprinkle half of the shredded cheese evenly over the bottom of the pastry crust. Top with the leeks, then the chives, and finally the goat cheese. Pour as much of the egg mixture as will fit, stopping within ½ inch of the rim. Sprinkle the remaining shredded cheese evenly over the top.
Bake the tart until the top is lightly puffed and golden and the filling jiggles only slightly when the pan is gently shaken, about 25 minutes. Remove the tart from the oven and let rest 10 minutes. If using a tart pan with a removable bottom, place the pan on your outstretched palm and let the ring fall away, then slide the tart onto a serving plate. Serve hot or at room temperature.