Preheat your electric waffle iron according to the manufacturer's .
In a small bowl, combine the beaten egg, ground pecans, heavy cream, melted coconut oil, and baking powder. If using, add the salt, vanilla, and cinnamon.
Whisk until the batter is smooth and well-combined.
Lightly grease the top and bottom plates of the hot waffle iron with cooking spray or a little extra coconut oil.
Pour the batter onto the center of the iron, spreading it slightly but being careful not to overfill.
Close the lid and cook for 1-3 minutes, or until the waffle is golden brown and steam is no longer coming from the iron.
Cooking time will vary based on your appliance.
The waffle is done when it releases easily from the iron. Carefully remove it with a fork or spatula and serve immediately.