The easiest keto chaffle recipe is right here, and it's only 2 ingredients! You probably have both of them on hand, and if you are already doing keto, you most definitely do!
When the iron is ready, place approximately ¼ cup of the mix into the iron. Close the lid and cook until it indicates it's finished. Repeat 3 more times to make a total of 4 waffles.
Remove to a rack to cool, then repeat with the remaining mixture.