Ingredients (10)

• 1 garlic clove, halved
• 2 tablespoons butter, divided
• 1 1/2 cups whole milk
• 1 1/2 cups heavy cream, divided
• 1 large egg
• 1 cup shredded Emmenthaler cheese, divided
• 1 1/2 teaspoons kosher salt
• 1/2 teaspoon freshly ground black pepper
• 1/4 teaspoon grated nutmeg
• 2 1/2 pounds Yukon gold potatoes, peeled, thinly sliced, rinsed, and patted dry