Meatball Boats

Ingredients:

 

1 lb. ground beef

1 large egg

1/3 cup breadcrumbs

1/4 cup grated Parmesan cheese

2 garlic cloves, minced

1 Tbsp. chopped parsley

Kosher salt

Freshly ground black pepper

1 Tbsp. olive oil

2 cup marinara sauce

4 crusty Italian sandwich rolls

12 slices provolone

1/2 cup shredded mozzarella

1/4 cup shredded parmesan