Slice one onion into small pieces.
Soak the bread in milk and set aside until the milk is all absorbed.
In a large mixing bowl place the meat, eggs, and spices all together.
Place the bread in the meat mixture and mix everything together.
Preheat oven to 350º degrees.
Place aluminum wrap on a baking sheet and spread some olive oil.
Use an ice cream scooper to get all the same size and roll into a ball.
Cook the meatballs for 25 minutes.
Place ½ cup tomato sauce on the bottom of a casserole dish and then place the meatballs on top.
Pour the tomato sauce on top along with mozzarella cheese on top.
Place in a casserole dish in the oven.
Return to the preheated oven and cook for 15 minutes until the cheese is melted.
Let cool for 10 minutes, sprinkle parmesan cheese and serve!