In a mixing bowl, combine the ground beef, breadcrumbs, egg, minced garlic, Italian seasoning, salt, and pepper. Mix until just combined, then form the mixture into 12 meatballs.
Press two olive halves into each meatball to create eyes. Set the meatballs aside.
Heat a large skillet over medium heat. Add the meatballs and cook, turning occasionally, until browned on all sides, about 8 minutes.
Pour the marinara sauce into the skillet around the meatballs. Reduce heat to low, cover, and simmer for 10 minutes until the meatballs are cooked through.
While the meatballs simmer, bring the chicken broth to a boil in a medium saucepan. Slowly whisk in the cornmeal. Reduce heat to low and cook, stirring often, for 15 minutes until thick and creamy.
Stir the Parmesan cheese into the cooked polenta until fully melted. Remove from heat.
Spoon the polenta onto plates or into shallow bowls. Top each serving with three meatballs and some of the sauce from the skillet. Add a few fresh basil leaves on top before serving.