Potato-Leek Gratin Recipe - BettyCrocker.com

Ingredients

• 2 1/2 cups milk
• 2 cloves garlic, finely chopped
• 1 teaspoon salt
• 1/4 teaspoon pepper
• 2 pounds potatoes, cut into 1/4-inch slices
• 3 medium leeks, sliced (2 cups)
• 1/4 cup sour cream
• 1 tablespoon Dijon mustard
• 1 cup shredded Swiss cheese (4 ounces)