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Onion Mushroom Green Bean Casserole Serves 6-8

Onion Mushroom Green Bean Casserole Serves 6-8 was pinched from <a href="http://12tomatoes.com/2014/10/side-recipe-caramelized-onion-mushroom-green-bean-casserole.html" target="_blank">12tomatoes.com.</a>
INGREDIENTS
2 pounds green beans, ends removed, halved
6 oz. cremini mushrooms, sliced
1 large yellow onion, sliced
1 egg, lightly beaten
1 cup crème fraiche (or heavy cream)
1 cup Parmesan cheese, grated
3 tablespoons butter, divided
1/4 teaspoon nutmeg
kosher salt and freshly ground pepper, to taste
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