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In a large, microwavable bowl, mix all three cereals and pecans.
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Whisk together butter and vanilla and pour over the cereal mixture, evenly coating all of it.
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In a small bowl, combine the brown sugar and pumpkin spice until mixed thoroughly.
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Sprinkle over the cereal mixture until well blended.
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Microwave uncovered on high for 5 minutes, stirring after every minute.
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Spread on wax paper and let cool.
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Eat your heart out.