Preheat your oven to 375°F (190°C).

In a large mixing bowl, combine ground beef, breadcrumbs, egg, Italian seasoning, salt, pepper, and minced garlic.

Shape the meat mixture into small meatballs, about 1 inch in diameter.

Heat a skillet over medium heat and add a tablespoon of oil. Brown the meatballs on each side for 6-8 minutes.

In the same skillet, pour marinara sauce and bring to a gentle simmer. Add the browned meatballs and coat them with the sauce.

Slice garlic bread rolls in half horizontally and lay the bottom halves on a baking sheet.

Assemble the bites by placing a slice of mozzarella cheese, a meatball, a spoonful of marinara sauce, and another slice of mozzarella on each roll.

Bake assembled bites in the preheated oven for 10-12 minutes or until cheese is melted and bubbly.

Remove from oven, let cool, and optionally garnish with fresh basil leaves before serving.