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Combine the cake mix, powdered peanut butter and the powdered sugar. Mix thoroughly.
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Slice butter into the mixture (I did about a tbsp for each slice) and pour the milk in. DO NOT MIX.
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Place mixture in the microwave for two minutes at full power.
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Remove mixture from the microwave and mix until the butter is fully integrated.
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Mix in the chocolate chips and peanut butter brittle.
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Spread into a lightly greased 8x8 glass pan and refrigerate for 2 hours.
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Pull out, cut and enjoy!