4. For the filling, beat the eggs in a medium bowl, add the cornstarch and icing sugar; Blend until smooth. Add the hot milk to the mixture and stir until incorporated.
5. We bring the mixture to the fire and constantly stir. Once the mixture has thickened, remove from the heat and continue to stir. Add La Villita margarine and vanilla extract.
6. Fill the donuts with a thin bag and sprinkle with powdered sugar for the finishing touch.
7. Enjoy!
