INGREDIENTS
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5 tablespoons unsalted butter (divided)
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1 cup fresh bread crumbs, from crustless French bread
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1 cup grated Tomme de Savoie or gruyere cheese, or aged hard goat cheese
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1 garlic clove, finely chopped
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1 tablespoon finely chopped mixed fresh herbs (preferably chives, tarragon and flat-leaf parsley)
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1/8 teaspoon freshly grated nutmeg (divided)
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Kosher salt and freshly ground black pepper
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1 cup low-sodium chicken broth
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1/2 cup heavy cream
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1 tablespoon all-purpose flour
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1 medium onion, finely chopped
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2 1/2 pounds Swiss chard, leaves and stems separated and both cut into 1-inch pieces
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1/2 pound spinach, coarse stems discarded, leaves coarsely chopped