Ingredients
  • 2 1/2 cups whole milk
  • 1 1/2 pounds Yukon Gold potatoes, peeled and very thinly sliced
  • 2 garlic cloves, smashed
  • 1 tablespoon unsalted butter
  • 1 large leek, trimmed, halved lengthwise, and sliced (about 2 cups)
  • 1 teaspoon kosher salt, divided
  • 2 ounces Gruy√®re cheese, shredded (about 1/2 cup)
  • 1 ounce Parmesan cheese, grated (about 1/4 cup)
  • 1/2 teaspoon freshly ground black pepper
Steps
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