Ingredients
- 2 tablespoons unsalted butter, plus more for the baking dish
- 1 medium onion, finely chopped
- 2 cups heavy cream
- 2 cups whole milk
- 1 bay leaf
- 1 teaspoon fresh thyme leaves
- ¼ teaspoon ground nutmeg
- kosher salt and black pepper
- 4 pounds russet potatoes (8 medium), peeled and sliced ⅛ inch thick
- 6 ounces Gruyère or Cheddar, grated (about 1½ cups)
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