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Mix together flour, cocoa and sugar in a large mug.
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Beat in the egg and oil until you get a glossy, smooth mix. Add in a few drops of any flavourings if you wish to make something a little different from a plain chocolate cake, peppermint or orange flavourings both work well.
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Stir in the chocolate chips and then place in the microwave for 1 and half minutes until cooked (the top will be sold with no liquid bits)
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Top with some optional extras if you wish, grated chocolate, chocolate sauce etc