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Put the egg and sugar in a bowl and mix.
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(If you use the butter, melt the butter in the microwave and add it to the mixture, now).
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Then add the cream, flour, baking powder and lemon peel and mix.
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Pour into cups until slightly more than half.
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Add the blueberries and put in the microwave at maximum power for about 3 minutes.
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Sprinkle with powdered sugar before serving.