INGREDIENTS
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For the topping:
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4 slices white sandwich bread, each slice torn into quarters
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2 tablespoons unsalted butter, softened
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¼ teaspoon table salt
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⅛ teaspoon ground black pepper
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3 cups canned fried onions (about 6 ounces)
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For the beans:
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2 pounds green beans, ends trimmed, halved
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3 tablespoons unsalted butter
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1 pound white button mushrooms, stems trimmed, wiped clean, and broken into ½-inch pieces
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3 medium cloves garlic, minced (about 1 tablespoon)
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Salt and freshly ground black pepper
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3 tablespoons unbleached all-purpose flour
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1½ cups low-sodium chicken broth
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1½ cups heavy cream