Instructions:
Preheat oven to 350 degrees. Melt 2 Tbsp butter in large skillet over medium heat. Stir in flour until smooth, and cook for 1 minute. Stir in salt, sugar, onion, and sour cream. Add green beans, stir to coat. Transfer mixture to a 2 1/2 quart casserole dish. Spread shredded cheese over the top. In a small bowl, toss together cracker crumbs and remaining butter, and sprinkle over cheese. Bake for 30 min until the top is golden and cheese is bubbly.
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