INGREDIENTS
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3 tablespoons butter, plus butter for greasing baking dish
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1 clove garlic, halved
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6 medium potatoes, peeled and sliced (about 5 cups)
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1 1/2 cup heavy cream
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1 cup Gruyere, grated
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1 cup Parmigiano Reggiano, finely grated
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1 cup low-sodium chicken stock
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3 tablespoons flour
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1 teaspoon nutmeg
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salt and freshly ground pepper, to taste
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