Pumpkin Scalloped Potatoes

Bahan-bahan (8 porsi)

• 1½ cups heavy whipping cream
• ½ cup unsweetened pumpkin puree
• 1 sprig fresh thyme
• 2 medium garlic cloves, (smashed)
• ¼ teaspoon ground nutmeg
• 2 pounds Yukon Gold potatoes, (peeled and cut into ⅛-inch slices)
• 2 pounds yams or sweet potatoes, (peeled and cut into ⅛-inch slices)
• kosher salt and freshly ground black pepper
• 4 ounces Fontina, Havarti or Swiss cheese, (shredded)
• ½ cup freshly grated Parmesan cheese