Preheat your oven to 400°F (204°C) and line a large rimmed baking sheet with parchment paper to prevent sticking.
In a large mixing bowl, combine the ground beef, Italian breadcrumbs, grated Parmesan cheese, beaten egg, minced garlic, Italian seasoning, salt, and black pepper.
Use your hands to gently mix the ingredients until just incorporated; do not overmix, as this can make the meatballs dense.
Portion and roll the mixture into 1.5-inch balls (approximately 24 meatballs) and arrange them evenly on the prepared baking sheet.
Bake for 15 to 17 minutes until the meatballs are browned and have reached an internal temperature of 160°F (71°C).
While the meatballs are baking, pour the marinara sauce into a large skillet and warm it over medium-low heat until simmering.
Once baked, carefully transfer the meatballs into the skillet with the marinara sauce, gently tossing them to ensure they are well-coated.
Place one mozzarella cheese circle on top of each meatball, followed by a slice of black olive in the center to create an 'eyeball' look.
Cover the skillet with a lid for 60 to 90 seconds, just until the cheese begins to soften and melt onto the meatball without losing its round shape.
Remove from heat and serve the 'eyeball' meatballs immediately, either on a platter or over pasta.