Preheat oven to 350.

Pour sauce and meatballs into pot and cook until heated through.

Slice bread to desired thickness while meatballs are cooking.

Butter outside of bread.

Carefully slice meatballs thin (without burning yourself.) :)

Layer two slices of provolone cheese, meatballs, parmesan cheese, then two more slices of provolone and then second piece of bread.

Bake sandwich for about 10 minutes, until cheese melts.

I then put the sandwich under the broiler for a couple minutes, until browned, flip sides and broil for another couple of minutes.

Enjoy!