Step 1

Preheat an air fryer to 325 degrees F (165 degrees C).

Step 2

Mix sweet manioc and sour manioc starches together in a bowl until fully combined.

Step 3

Combine milk, water, olive oil, and salt in a saucepan and bring to a boil. Reduce heat and add starches. Stir until liquid is absorbed; the mixture will be very dry. Remove from heat and allow mixture to cool just until safe to handle.

Step 4

Add eggs to the starch mixture in the saucepan; mix until smooth and dough pulls away from the sides. Add Cheddar cheese and Parmigiano-Reggiano cheese; mix well.

Step 5

Using gloved or lightly oiled hands, pinch off a golfball-sized piece of dough, roll into a ball, and place on a plate. Repeat with remaining dough. Line the air fryer with a piece of parchment paper. Place balls into the basket in batches, approximately 1 inch apart.

Step 6

Bake in the air fryer until browned outside, 8 to 10 minutes. Repeat with remaining balls.