Preheat the oven to 400˚F. Line a baking sheet with aluminium foil. Set aside.
Place all the ingredients in a large bowl. Mix together with your hands until fully combined.
Form into balls. I used this cookie scoop. Place on the prepared baking sheet, and place in the preheated oven for 20-22 minutes, or until they are brown. Remove from the oven, and place on a plate lined with paper towels. Allow to cool. Place in a freezer bag and try to remove as much air as possible. (I place a straw in the bag and close it until only the straw is sticking out of the small hole. Suck the air out. It now looks vacuum sealed!)
When ready to use, defrost in the refrigerator in the morning and they should be defrosted for dinner. Alternatively, you can throw the frozen meatballs into a sauce, and allow to simmer for around 20 minutes.