Preheat the waffle maker and grease it lightly.
In a bowl, mix mozzarella cheese, egg, baking powder, garlic powder, and Italian seasoning.
Pour half of the mixture into the waffle maker and cook for 3-4 minutes until golden brown.
Remove the chaffle and repeat with the remaining batter.
Spread pizza sauce over the cooked chaffles and top with shredded cheddar cheese and pepperoni.
Bake in a preheated oven at 375°F for 5 minutes until cheese melts.
Serve hot and enjoy your delicious low-carb chaffle pizza!