Classic Potato Gratin | America's Test Kitchen

Ingredients

• 1 large clove garlic, peeled and smashed
• 1 tablespoon unsalted butter, softened
• 2 1/4 cups half-and-half
• 1 1/4 teaspoons table salt
• 1/8 teaspoon ground black pepper
• Pinch fresh grated nutmeg
• Pinch cayenne pepper (optional)
• 2 pounds all-purpose potatoes, peeled and sliced 1/8-inch thick or less