4. For the filling, we beat the eggs in a medium bowl, add the cornstarch and icing sugar; Mix until smooth. Add the warm milk to the mixture and stir everything until incorporated.
5. We take the mixture to the fire and stir constantly. Once the mixture thickens, remove from heat and continue stirring. Add La Villita margarine and vanilla extract.
6. Fill the donuts with a thin bag and sprinkle with powdered sugar for the final touch.
7. Enjoy!
