Let's cook.
Preheat your waffle iron according to the manufacturer's instructions.
In a large bowl, whisk together the tapioca flour, milk, vegetable oil, egg, and salt until smooth.
Fold in the shredded mozzarella cheese and grated Parmesan cheese until just combined.
Lightly grease the preheated waffle iron with cooking spray or a brush of oil.
Pour approximately 1/2 cup of batter per waffle onto the hot waffle iron.
Cook for 4-6 minutes, or until the waffles are golden brown and crispy.
Carefully remove the waffles from the iron and serve immediately.
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