INGREDIENTS
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•2 tablespoons butter
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•2 tablespoons all-purpose flour
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•1 teaspoon salt
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•1 teaspoon white sugar
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•1/4 cup onion, diced
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•1 cup sour cream
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•3 (14.5 ounce) cans French style green beans, drained
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•2 cups shredded Cheddar cheese
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•1/2 cup crumbled buttery round crackers
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•1 tablespoon butter, melted