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Place cereal in a medium bowl and brownie mix in a zip top gallon bag.
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Melt chocolate chips and peanut butter in the microwave, stirring every 30 seconds, or in the top of a double boiler over simmering water. I used the double boiler method because my microwave burns chocolate no matter how careful I am.
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Pour the chocolate and peanut butter over the cereal and stir well to coat all the pieces.
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Pour the cereal into the bag with the brownie mix, close and shake to coat.
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Spread on waxed paper to cool. Store in an airtight container.