Sweet and White Potato Gratin with Bay Butter

1. Preheat Oven and Infuse Butter

Begin by preheating your oven to 400°F (200°C). In a small saucepan, melt the unsalted butter over low heat and add the bay leaves. Allow the butter to simmer with the bay leaves for one minute, then remove it from the heat and let it steep for ten minutes.

2. Season Potatoes

In a large bowl, combine the thinly sliced sweet potatoes and russet potatoes with the bay-infused butter. Season the potatoes with sea salt and freshly ground black pepper, ensuring they are evenly coated.

3. Layer Potatoes and Garlic

Layer the seasoned potatoes in a 13 x 9-inch baking dish. As you stack, scatter the roughly chopped garlic cloves throughout the layers.

4. Add Cream and Cheese

Pour the heavy whipping cream over the top, allowing it to seep down between the layers. Evenly sprinkle the finely grated Parmesan cheese over the top of the potato layers.

5. Bake the Gratin

Transfer the dish to the preheated oven and bake for one hour. Check for doneness by piercing the potatoes with a knife; they should be tender, with a golden and crispy top.