"From Barefoot Contessa..."
INGREDIENTS
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2 tablespoons unsalted butter
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3 tablespoons all-purpose flour
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2 cups hot milk
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1 teaspoon kosher salt
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1/2 teaspoon fresh ground black pepper
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1 pinch nutmeg
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12 ounces gruyere, grated (5 cups)
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1/2 cup freshly grated parmesan cheese
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16 slices white bread, crusts removed
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Dijon mustard
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8 ounces baked virginia ham, sliced but not paper thin