INGREDIENTS
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6 tablespoons (3/4 stick) unsalted butter, plus extra for topping
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1 pound yellow onions, cut in 1/2 and sliced (3 large)
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2 pounds zucchini, sliced 1/4-inch thick (4 zucchini)
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2 teaspoons kosher salt
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1 teaspoon freshly ground black pepper
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1/4 teaspoon ground nutmeg
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2 tablespoons all-purpose flour
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1 cup hot milk
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3/4 cup fresh bread crumbs
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3/4 cup grated Gruyere
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