Step 1

In an 8 oz microwave-safe mug, add all ingredients except chopped chocolate.

Step 2

Mix with a small whisk until batter is completely mixed and no flour or cocoa lumps remain. The batter with be very thick. Scrape down the edges of the batter with your whisk and use the whisk to evenly spread out the batter.

Step 3

Add half the chocolate to the mug and briefly stir into batter. Sprinkle remaining chocolate on top of the batter.

Step 4

Cook cake for about 50 seconds at full power. (I used an 1100 watt microwave. You may need to adjust time and/or power if you are using a different wattage) or until the top of brownie mostly set. Allow brownie to cool a few minutes and then eat the brownie while warm.