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Step 1
Add everything except chocolate chips into a microwave-safe mug that can hold at least 12 oz of liquid. Whisk with a small whisk until batter is smooth. Make sure batter is evenly mixed and egg is completely incorporated.
Step 2
Stir in half of the chocolate chips. Sprinkle remaining on top.
Step 3
Cook cake at full power in the microwave for about 1 minute to 1 minute 15 seconds. Cake is best eaten warm.