The best method for freezing this appetizer is to prepare the recipe as directed but do not bake the balls. Instead, place the balls on the cookie sheet then place the cookie sheet in the freezer. Instead, place the ball in layers separated by wax paper in an airtight container. The arancini balls can be frozen for 1-2 months.
When needed, move the arancini balls to the fridge to thaw completely. Then place them back on a baking sheet and bake as directed. The balls can also be baked from frozen, but you will need to increase the bake time by 5-10 minutes.