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6-8 servings
5 tablespoons unsalted butter, divided
1 sweet onion, thinly sliced
3 garlic cloves, minced
1 tablespoon grainy mustard
2 cups half-and-half
2 pounds potatoes, peeled and thinly sliced
Salt and freshly ground black pepper
½ teaspoon freshly grated nutmeg
¾ cup grated Gruyère cheese
Read more: Best Ever Potatoes au Gratin | Recipes | PureWow Recipes
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1st Keep
 Celestielj
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