In a mixing bowl, combine the ground beef, breadcrumbs, Parmesan cheese, parsley, egg, garlic, salt, pepper, and Italian seasoning.

Use your hands to shape the mixture into meatballs about 1 inch in diameter.

Heat a skillet over medium heat and add a drizzle of oil. Sear the meatballs for about 5 minutes, turning them to brown all sides.

Pour the marinara sauce over the browned meatballs in the skillet. Simmer on low heat for about 15 minutes.

While the meatballs are cooking, bring a large pot of salted water to a boil.

Add the spaghetti to the boiling water and cook according to package instructions, usually about 8-10 minutes.

Once the spaghetti is cooked, drain it and add it to the skillet with the meatballs and sauce. Toss gently to coat the pasta.

Serve the spaghetti and meatballs hot, garnished with additional Parmesan and parsley if desired.