Whisk eggs in a bowl. Add shredded mozzarella, vanilla extract, cinnamon, and sweetener. Stir until well combined.
Turn the waffle maker on and grease waffle iron with olive oil.
Spoon the batter into waffle slots and cook for 2-3 minutes or until golden. Continue with the remaining batter.
Place dark chocolate in a microwave safe bowl and melt the chocolate in a microwave for 1-2 minutes stirring occasionally (if using). You are free to use any of your favorite low-carb toppings.