Spray square cake pan with non-stick spray. In a medium bowl put peanut butter, chocolate chips, and butter in microwave for about 2 1/2 minutes. Stir, add the marshmallows, cook for about 1 minute more, or until mostly melted. Stir and add cereal. Pour into greased pan, refrigerate for a few hours, cut in squares. Keep regrigerated to keep its shape.
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