Preheat your oven to 375°F (190°C).

In a large mixing bowl, combine the ground beef, breadcrumbs, egg, Italian seasoning, salt, pepper, and minced garlic. Mix thoroughly until well combined.

Roll small portions of the meat mixture into meatballs about 1 inch in diameter.

Heat a skillet over medium heat and add 1 tablespoon of oil. Brown the meatballs on all sides for about 6-8 minutes, then drain any excess grease.

In the same skillet, pour in the marinara sauce. Add the browned meatballs, lower the heat, and let them simmer for about 5 minutes.

Slice each garlic bread roll in half horizontally and lay them open.

For each roll half, place a piece of mozzarella cheese, add a meatball with some marinara sauce, and top with another slice of mozzarella cheese.

Arrange the assembled rolls on a baking sheet. Bake for 10-12 minutes until the mozzarella is melted and bubbly.

Let them cool for a minute and garnish with fresh basil leaves if desired. Serve hot.