INGREDIENTS
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1 Chocolate cake mix of your choice
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15 ounce can of pumpkin puree
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3 sticks unsalted butter, divided
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1/4 cup light brown sugar, packed
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1/2 cup pumpkin puree
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1/2 teaspoon ground cinnamon
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1/4 teaspoon freshly grated nutmeg
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2 pound bag powdered sugar, plus 2 cups