INGREDIENTS
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2 1/2 pound green beans,
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trimmed and cut into 1- to 2-inch pieces (about 8 cups)
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2-3 tablespoons extra-virgin olive oil, divided
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1 medium onion, thinly sliced
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3 tablespoons all-purpose flour
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3/4 teaspoon salt
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1/4 teaspoon white or black pepper
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2 1/2 cups low-fat milk
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1 1/2 cups fresh whole-wheat breadcrumbs