In a large, microwave safe mug, add chocolate chips and vegetable oil. Heat in the microwave for about 40 seconds until chips are semi-melted. Stir with a whisk to completely melt chocolate chips and form a smooth chocolate batter.
Add remaining ingredients. Mix with whisk until smooth.
Cook in microwave at full power for about 1 minute. The top of the cake should look done with the edges still slightly gooey. Allow the cake to cool for 5-10 minutes before consuming. When the cake is cooking in the microwave, it will rise very high, but will sink back down considerably once finished. This is normal since this is meant to be a rich flourless cake. You can plate cake in a smaller mug before serving.
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.