Preheat oven to 200C. Prick pie crust all over with a fork and place on a baking sheet.

Bake in the preheated oven until lightly golden, about 15 minutes. Remove crust and set aside to cool slightly. Reduce oven temperature to 190C.

Bring a large pot of water to a boil and simmer leeks just until tender, about 7 minutes. Drain thoroughly. Whisk eggs, heavy cream, milk, chives, nutmeg, salt, and black pepper together in a bowl.

Spread leeks evenly over bottom of pie crust and then, dot with goat cheese. Pour egg mixture over leeks.

Bake in the preheated oven until puffed, lightly browned, and a sharp knife inserted near the center comes out clean, 40 to 50 minutes. Remove to cool until warm or room temperature before serving.