Potato Leek Au Gratin

Say hello to your new favorite show-stopping holiday side dish, Potato Leek Au Gratin.

PREP: 20 mins
COOK: 1 hr 30 mins

* See bottom of steps for Hints & Tips.

MAKE AHEAD:
* This leek and potato gratin is the ideal make-ahead dish, and we know those words are music to your ears. You can easily assemble this recipe 48 hrs ahead of time.

4 tbsp butter

1 ½ cups whole milk

1 cup heavy cream

3 large garlic cloves finely chopped

1 tbsp stone ground mustard

¼ tsp freshly grated nutmeg

¾ tbsp kosher salt

1 tsp freshly ground pepper

2 oz blue cheese

6 oz grated Gruyere cheese

2 oz freshly grated parmesan cheese

3 lb leek, white and light green portions, washed and sliced into ¼ inch rings

2 lb russet potatoes (3 to 4 medium), peeled and cubed into ¾ inch pieces

3 tbsp minced fresh chives

Directions at themodernproper.com

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