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Beat eggs until light (about 1 minute on high).
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Beat in sugar and salt. Add the vanilla. Mix in the melted butter.
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Add the cocoa and flour using the low speed on mixer.
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Pour into a microwave safe dish (8 x8 or a round cake pan -- your microwave time will depend on what you use.).
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Microwave on high for 3 to 5 minutes on a turntable, preferably. Do not let the center get totally dry or it will be overcooked. I took mine out when there was just a small moist spot in the center, but next time I will probably let it bake for maybe 10 seconds less. It finishes cooking as it cools.
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You can frost if you like, but I prefer my brownies unfrosted.