In a bowl, combine the ground beef with breadcrumbs, grated Parmesan cheese, egg, crushed garlic, salt, and pepper. Mix well until thoroughly combined, then form into small meatballs.
Heat olive oil in a skillet over medium heat. Cook the meatballs until browned on all sides.
Pour the tomato sauce over the meatballs and simmer over low heat for 10 minutes, allowing the flavors to meld.
Toast the cut sides of the burger buns until golden brown.
Place iceberg lettuce on the bottom bun, top with the tomato sauce-covered meatballs, then layer with sliced mozzarella cheese. Cover with the top bun and serve immediately.
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