In a bowl mix together the egg, cocoa powder, and sweetener. Lastly add the baking soda and mix. Pour the batter into microwavable silicone cupcake liners, or 1 medium bowl (to make a small cake), or 3 small bowls (to make it cupcake size), people often use a coffee mug too. I found that one batch made 3 cupcakes. *If you are using bowls or a coffee mug you should lightly grease the inside with butter, coconut oil, or your preferred cooking fat. Microwave all three cupcakes at once for 1 minute or until baked. *Note, the batter will rise very high at first and then deflate as it is finished baking. Test the cupcakes for doneness by inserting a toothpick in the middle. If the toothpick comes out clean it is finished, if not microwave for a few more seconds. Eat!