If baking, preheat oven to 350 degrees F
In a medium mixing bowl, stir to combine rice, egg, sauce and 3 T breadcrumbs
Add 1/2 cup breadcrumbs to separate bowl
Chop mozzarella into 1-inch cubes
Scoop out about 1/4 cup of the rice mixture, add a mozzarella cube to the centre and mold the rice around it - in the shape of an egg
Dip rice ball into breadcrumbs, covering completely
Set aside on a plate, and continue until there is no rice mixture left
If you are frying the arancini, using a medium sized frying pan, pour in oil until about half full and turn on medium-high heat
For frying, oil is ready when you sprinkle a pinch of flour into oil and it sizzles
Place each rice ball into the oil, for about one minute per side. Remove from oil and place on a paper towel lined plate before serving
For baking, place breaded rice balls onto an aluminum foiled baking sheet and bake for 15 minutes.
Enjoy while hot, add some tomato sauce to the side for dipping