Preheat oven to 375F. In a bowl, combine ground beef, onion, garlic, ketchup, mustard, salt pepper, bread crumbs, Parmesan cheese and eggs. Mix well with your hands until evenly incorporated.
Place meat mixture in a 8 x 4 inch loaf pan and round the top to form a "loaf. Top with a thin layer of ketchup, and mozzarella.
bake for about 45-60 minutes until the center internal temperature reads 155-160 F . Let it rest for about 5-10 minutes. It will continue to cook and come up to about 160-165 F. Slice and serve!