INGREDIENTS
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2 pounds green beans, ends removed, halved
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6 oz. cremini mushrooms, sliced
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1 large yellow onion, sliced
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1 egg, lightly beaten
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1 cup crème fraiche (or heavy cream)
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1 cup Parmesan cheese, grated
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3 tablespoons butter, divided
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1/4 teaspoon nutmeg
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kosher salt and freshly ground pepper, to taste