Cheesy mozzarella green bean casserole

Cheesy mozzarella green bean casserole was pinched from <a href="http://12tomatoes.com/a-twist-on-the-classic-casserole-cheesy-mozzarella-green-bean-melt/" target="_blank" rel="noopener">12tomatoes.com.</a>
INGREDIENTS
1 1/2 pounds fresh French green beans, halved, ends removed (or use 2 cans green beans, rinsed and drained)
10 oz. mozzarella cheese, grated
1 cup sour cream
1/4 white onion, finely chopped
3 tablespoons unsalted butter
2 tablespoons all-purpose flour
1/2 teaspoon garlic powder
kosher salt and freshly ground pepper, to taste
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