Stir together first 5 ingredients. Pour into a lightly greased 13 x 9 inch baking dish. Sprinkle cake mix evenly over pumpkin mixture; sprinkle evenly with pecans. Drizzle butter evenly over pecans. Bake at 350 degrees for 1 hour and 5 minutes or until golden brown. Remove from oven, and let stand 10 minutes before serving. Serve warm or at room temperature with whipped cream if desired.
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