Preheat oven to 350°F. Line a sheet pan with parchment paper. Set aside.

In a large skillet, over medium heat, brown ground beef until no longer pink. Add spaghetti sauce, salt, and pepper. Reduce heat to low and simmer for 10 minutes.

Add cooked noodles and toss to coat. Set aside and cover to keep warm.

In a medium bowl combine butter, garlic, salt, and parsley. Stir until well combined.

Cut the centers out of the tops of the rolls, making sure that the base of the bread remains attached, so not cutting all the way through. Place rolls on the parchment paper-lined sheet pan.

Spoon and brush the garlic butter sauce equally on each roll (inside and out). You will use 2-3 tablespoons of the garlic butter sauce per roll.

Fill each roll with 1 tablespoon shredded mozzarella cheese, ½ cup of the spaghetti mixture, and another 1 tablespoon mozzarella cheese.

Bake for 7-10 minutes, or until golden brown. Top with parsley, for garnish.