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In a large pan, melt the butter and coconut oil over medium-low heat.
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Stir in the marshmallows and continue to stir until melted, about 8 minutes.
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Once the marshmallows are melted, stir in the cereal. Stir to combine evenly.
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Spread the rice crispy treat mixture evenly in a 9x13 baking dish.
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Cool.
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Enjoy!