Preheat oven to 350°F. Lightly grease a 5 oz ramekin with cooking oil spray.
Add the egg to a medium bowl. Using a mini whisk, beat vigorously for 1 full minute. This ensures the egg is fully beaten and adds some volume to the egg which will help make the cake rise.
Add in cocoa powder and erythritol. Whisk until batter is smooth.
Pour batter into prepared ramekin. Bake for 20-25 minutes or until cake puffs up and when you apply pressure to the surface, the cake bounces back and doesn't sink in. Toothpick inserted should come out mostly clean.
Let cake cool for about 15-20 minutes before serving.
Notes
Erythritol granular can be replaced with other granular sugar substitutes like Swerve or Lakanto monkfruit sweetener.
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Estimated nutrition provides total carbs, carbs from erythritol and net carbs. The net carbs count excludes fiber and carbs from erythritol. If you are on a keto diet, please remember to look at net carbs and not just total carbs.
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.