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Also required: 1 large coffee mug.
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Add dry ingredients to mug, and mix well.
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Add the egg and mix thoroughly.
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Pour in the milk and oil and mix well.
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Add the chocolate chips (if using).
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Add vanilla extract, and mix again.
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Put your mug in the microwave and cook for 3 minutes at 1000 watts.
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The cake will rise over the top of the mug, but don't be alarmed!
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Allow to cool a little, and tip out onto a plate if desired.
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EAT! (can serve 2 if you want to feel slightly more virtuous).