Preheat the oven to 400 degrees
In a large bowl, mix together all of the ingredients except the pizza sauce and cheese. (don't over mix, it makes the meat tough)
Spray a large baking sheet with cooking spray. Roll the meat into 1 inch size balls.
Bake in the oven at 400 degrees for 20 minutes.
Meanwhile, in a large saucepan, heat up the pizza sauce and add the meatballs to it when they are ready.
Finally, assemble the subs. I like to put Parmesan on first, then the meatballs, then the mozzarella. Place back in the oven for a few minutes to melt the cheese and toast the bread.Enjoy!