Scalloped Potato Gratin

INGREDIENTS

• 1 1/2 cups heavy cream
• 3 bay leaves
• Salt and freshly ground black pepper
• 2 garlic cloves, chopped
• Unsalted butter
• 2 pounds russet potatoes, peeled and cut into 1/8-inch-thick slices
• 2 sprigs fresh thyme, plus more to finish
• 1/2 cup grated Parmesan, plus more for broiling
• 1/2 teaspoon freshly grated nutmeg