"These basic scalloped potatoes are made with a savory homemade sauce. You can make this dish in advance; refrigerate for several hours or overnight...."
INGREDIENTS
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6 medium red-skinned potatoes, about 1 1/2 to 2 pounds
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3 tablespoons butter
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6 green onions, with 2 inches green, sliced, optional
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3 tablespoons all-purpose flour
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2 cups whole milk
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1/8 teaspoon pepper
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salt, to taste
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1/4 teaspoon dried mustard
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dash nutmeg, ground or freshly grated