Preheat oven to 375 degrees F (190 degrees C). Grease a baking sheet or line with parchment paper.
In a large bowl, mix together the tapioca flour, eggs, oil, milk, and salt until well blended. Add the Parmesan cheese and mozzarella cheese and mix until combined.
Shape the dough into small balls and place on the prepared baking sheet. Bake for 25 minutes, or until golden brown.
Serve warm.
Interesting Facts
Po-de-Queijo is the traditional breakfast food in Brazil.
The dough can be flavored with garlic, herbs, and spices for added flavor.
This dish is also popular in Argentina, Uruguay, and Paraguay.