01 - Combine ground turkey, breadcrumbs, Parmesan, egg, minced garlic, parsley, oregano, salt, pepper, and milk in a large bowl. Mix gently until just incorporated without overmixing.
02 - Form mixture into 16 to 18 evenly sized meatballs.
03 - Heat 2 tablespoons olive oil in a large skillet over medium heat. Add meatballs in batches and brown on all sides for about 5 minutes total. Transfer browned meatballs to a plate.
04 - In the same skillet, heat 2 tablespoons olive oil. Cook onion until soft, approximately 4 minutes. Add garlic and sauté for another minute.
05 - Add crushed tomatoes, dried basil, oregano, sugar (if using), salt, and black pepper. Bring to a simmer.
06 - Gently add browned meatballs to the sauce. Cover and simmer over low heat for 20 to 25 minutes until internal temperature reaches 165°F (74°C).
07 - Adjust seasoning to taste. Stir in fresh basil if desired. Serve hot with pasta, polenta, or crusty bread.