"Chanterelle mushrooms and cipollini onions are worth the splurge, but you can substitute halved cremini mushrooms and frozen pearl onions and the results will still be very tasty...."
INGREDIENTS
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4 tablespoons olive oil, divided
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1 pound cipollini onions, peeled (halved if large)
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2 pounds green beans, stem ends trimmed
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6 tablespoons unsalted butter, divided
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8 ounces chanterelle mushrooms,* rinsed, wiped clean, and larger pieces torn into quarters lengthwise
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1/3 cup minced shallots
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2 tablespoons chopped fresh thyme leaves
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1 teaspoon kosher salt
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1/4 teaspoon pepper
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1/3 cup reduced-sodium vegetable broth