Soak beans overnight in water to cover in large saucepan. Drain beans and add fresh water to cover. Cook until water is absorbed.
Combine beans with next 4 ingredients and 1/2 cup butter in casserole, mixing well. Stir in sour cream. Drizzle 1/3 cup butter over casserole. Bake at 300 degrees F for 2 hours, stirring every half hour.
By Robin from Washington, IA
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