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Sweet Potato-Russet Potato Gratin with Horseradish & a Dijon Crust

Susie Middleton
  • minutes
  • Serves

INGREDIENTS

2 tbsp

Flat-leaf parsley, fresh

1

Russet potato (12 oz.)

1 cup

Shallots

1

Sweet potato (12 oz.)

2/3 cup

Chicken broth, homemade or low-salt canned

1 tbsp

Dijon mustard

2 tbsp

Horseradish, prepared

1

Black pepper, Freshly ground

2

Kosher salt

1 1/2 cups

Breadcrumbs, coarse fresh

4 tbsp

Butter, unsalted

2/3 cup

Heavy cream

7 1/3 tbsp

Parmigiano reggiano, grated