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.

Form the mixture into small balls, about 1 inch in diameter, yielding approximately 12 meatballs.

Heat a skillet over medium heat, add olive oil, and brown the meatballs on all sides for about 6-8 minutes.

In the same skillet, add marinara sauce and gently add the browned meatballs. Let simmer for about 5 minutes over low heat.

Slice each garlic bread roll in half horizontally. Prepare a baking sheet.

Assemble the bites: place a slice of mozzarella on each roll, add a meatball, spoon marinara sauce over it, and top with another slice of mozzarella.

Bake for 10-12 minutes until the cheese is melted and bubbly.

Serve hot, optionally garnished with fresh basil leaves.