Marinate ground beef in a bowl with onion, garlic, egg, salt, pepper, and spices.
Mix well.Add 1 cup of grated Parmesan and mayonnaise in and mix well.Form meatballs (about 16 pieces) and put them in a glass baking dish and top with marinara sauce.
Cover the dish with foil and put it in a preheated 375F oven for 30-40 min.
Once done sprinkle it with the remaining 1/2 cup of shredded parmesan and bake for another 5 minutes until the cheese is melted.Remove from heat and enjoy!