Heat your waffle maker as per the manufacturer’s guidelines.
In a large bowl, mix the shredded mozzarella cheese with the almond flour until well blended.
In another bowl, beat the eggs and then add the erythritol, baking powder, vanilla extract, ground cinnamon, and salt, whisking until smooth.
Gradually incorporate the wet mixture into the dry ingredients, stirring until fully combined.
Fold in the melted butter along with any optional ingredients like chocolate chips or nuts for extra flavor.
Lightly coat the waffle maker with non-stick spray.
Pour half of the batter into the hot waffle maker, close the lid, and cook for about 3-5 minutes, or until the chaffle is golden and crispy.
Gently remove the first chaffle and repeat the process with the remaining batter.
Let the chaffles cool for a few moments before serving.