In a microwave-safe mug (that can hold at least 12 oz of liquid), add all ingredients except chocolate chips. Mix with a small whisk until batter is smooth.
Sprinkle surface of batter with mini chocolate chips. You do not need to stir them into the batter as they will sink in as the batter cooks.
Cook the cake in microwave at full power for about 1 minute and 30 seconds. If desired, sprinkle a handful of chocolate chips on top of the cake before eating.
Notes
I used a 1000 watt microwave. You may need to adjust time and/or power if you are using a different wattage.
Make sure to use a microwave-safe mug that can hold at least 12 oz of liquid. The cake will rise quite high while cooking and then will sink down a little as it cools.
Because this batter contains no flour, the chocolate tends to sink to the bottom. I recommend using mini chocolate chips because they are lighter so they won't sink to the bottom.
Since most of the chocolate is below the surface of the cake, I also scattered a handful of Lily's keto baking chips (which are the size of regular chocolate chips) on top while the cake was still warm. However, you can just use the mini chocolate chips.
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Estimated Nutrition Information is calculated with Lily's dark chocolate chips and does not include carbs from erythritol
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.