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Mix the cocoa, walnuts, chocolate chips, and graham crackers.
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Set aside.
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Beat the egg until frothy.
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Melt the butter in a saucepan, add the sugar and bring to a boil.
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(I haven't tried this in a microwave, but it would likely work).
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Remove from heat, add the egg and mix well (yes it will look weird).
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Add the graham cracker mixture, and mix well.
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Press firmly into a buttered 8" x 8" pan.
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When cool, frost with a chocolate frosting, either your own recipe or a tinned one, Or if you're brave and don't need to measure, my method of making chocolate icing is to put some (probably two cups) icing sugar in a bowl, add several heaping tablespoons of cocoa, 2 tablespoons of butter and then add just enough milk to make a smooth, creamy texture.
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If it gets too runny add more icing sugar.