Combine the ground beef, breadcrumbs, egg, Italian seasoning, salt, and black pepper in a mixing bowl. Form the mixture into 8 small meatballs of equal size.
Heat a large skillet over medium heat and cook the meatballs, turning them often until browned on all sides and cooked through.
Warm the marinara sauce in a small saucepan while the meatballs finish cooking.
Place one cooked meatball on the bottom half of each slider bun. Spoon marinara sauce over each meatball.
Lay one slice of mozzarella cheese on top of the sauce and add two black olives to create eyes. Place the top bun over the cheese.
Return the assembled sliders to the skillet for one minute with the lid on to melt the cheese slightly.