01 - In a large bowl, combine ground turkey, egg, breadcrumbs, Parmesan, garlic, parsley, oregano, salt, pepper, and milk. Mix gently until just combined—do not overmix.
02 - Shape the mixture into 16 meatballs (about 1½ inches each).
03 - Heat 1 tbsp olive oil in a large skillet over medium heat. Add meatballs in a single layer and brown on all sides for 5–6 minutes (they do not need to be cooked through). Remove and set aside.
04 - In the same skillet, add 1 tbsp olive oil. Sauté onions over medium heat for 3–4 minutes until translucent. Add garlic and cook for 1 minute.
05 - Stir in crushed tomatoes, dried basil, oregano, sugar (if using), salt, and pepper. Bring to a simmer.
06 - Return meatballs to the sauce. Cover and simmer gently for 20–25 minutes, until meatballs are cooked through (internal temperature should reach 165°F).
07 - Taste and adjust seasoning. Garnish with fresh basil if desired. Serve hot over pasta, rice, or with crusty bread.