INGREDIENTS
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1 1/2 pounds fresh French green beans, halved, ends removed (or use 2 cans green beans, rinsed and drained)
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10 oz. mozzarella cheese, grated
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1 cup sour cream
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1/4 white onion, finely chopped
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3 tablespoons unsalted butter
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2 tablespoons all-purpose flour
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1/2 teaspoon garlic powder
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kosher salt and freshly ground pepper, to taste