Onion Mushroom Green Bean Casserole

Onion Mushroom Green Bean Casserole 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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