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Place all the ingredients in a mug and mix well, you may want to use a fork to make sure you get all the flour from the bottom of the mug.
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Place the mug in the microwave for 1 and a half minutes, the cake will rise and should be firm on the top, this is when it is done. If it's still a little wet on the top put it back in the microwave for another 30 seconds.
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Serve with another handful of blueberries.