Meatball Sub Egg Rolls

Name: Meatball Sub Egg Rolls
Ingredients: 1 large egg; 1 lb. ground beef; 0.25 yellow onion, finely chopped; 1.25 oz. finely shredded Parmesan (about 1/2 c.); 1.25 oz. finely shredded provolone (about 1/3 c.); 3 cloves garlic, finely chopped; 2 tbsp. chopped fresh flat-leaf parsley; 2 tbsp. Italian-seasoned bread crumbs; 1 tbsp. chopped fresh basil; 1 tbsp. chopped fresh oregano; 1 tsp. kosher salt; 0.5 tsp. freshly ground black pepper; 1.5 c. store-bought or homemade marinara sauce, divided; 9 egg roll wrappers; 2 c. shredded low-moisture mozzarella