Heat the butter in a medium sauce pan over medium heat. Add the meatballs and cook until golden brown on all sides.

​

Add the marinara to the pan and cook until sauce is hot.

​

Preheat broiler.

​

Meanwhile, make sandwiches on a sheet pan by adding four to five meatballs to each french roll and top each with 1/3 of the mozzarella cheese, parmesan cheese, and basil.

​

Place sandwiches under the broiler for a minute or two, or until cheese is melted. Serve while hot.