In a small bowl, beat egg with fork and add in the rest of the ingredients until.
a smooth batter is formed.
Pour into a cup which will hold 8 ounces. You could use a coffee mug.I Pammed it.Microwave for one minute.
The carb count would depend on the sweetener. You could use Davinici syrup.I don't think it would affect the texture of the cake.But, without the sweetener, you would have .7 carb for the egg and 2 NET carbs for the cocoa powder.About 3 net carbs in all.then add the sweetener carbs.