Preheat oven to 350F and line a small, shallow loaf pan (7.5 x 3.5-inch) with parchment paper.
In a large bowl, combine avocado, sweetener (optional), eggs, and vanilla extract.
Combine coconut flour, baking soda, salt, and cocoa powder (optional). Add dry ingredients to the avocado batter and mix until well incorporated. Allow batter to rest for 5 to 10 minutes.
Transfer batter to lined loaf pan and bake for approximately 45 minutes, or until the top has browned and it passes the clean toothpick test.