Place all the ingredients in a bowl, mix together, and shape into balls.
For the breading:
In three separate bowls, place the flour, the egg yolks, and the panko. Bread the parmesan balls dipping them first in the flour, then in the egg yolk, and finally in the panko.
Fry over medium heat until they turn golden.
Serve the parmesan balls warm.
Notes
Fry the parmesan balls over low heat for them to cook well inside.