Heat oven 375 degres F .Heat gently in a 9″x 9″ baking pan or cover with non-stick cooking spray.
In a large bowl, combine beef, pork, eggs, panko, Parmesan, garlic powder, onion powder, allspice, and nutmeg; Add salt and pepper to taste. Utilize a wooden spoon , stir To well combined. Roll the mixture into 1/4 to 1/2 inch meatballs, forming about 18-20 meatballs.
Heat olive oil in a saucepan on heat.Add the meatballs in portions and fry until golden brown for about 23 minutes. Transfer to a plate lined with a paper towel; Sit aside.
In a large saucepan of boiling salted water, cook pasta according to package instructions; Drain well and stir in the marinara sauce.
Add pasta to the prepared baking dish and add meatballs; Sprinkle mozzarella cheese.Bake in the oven until bubbles form and heat up completely, about 15-20 minutes.
Serve immediately, garnished with parsley, if desired.