01 - In a large bowl, combine ground turkey, breadcrumbs, egg, Parmesan, garlic, onion, parsley, oregano, salt, pepper, and milk. Mix gently until just incorporated, taking care not to overwork.
02 - Form the mixture into 16 golf ball-sized portions.
03 - Heat 2 tablespoons olive oil in a large skillet over medium heat. Add meatballs and cook, turning to brown all sides, about 5 to 7 minutes. Remove and set aside; they do not need to be fully cooked at this stage.
04 - In the same skillet, warm 2 tablespoons olive oil over medium heat. Add garlic and sauté until fragrant, approximately 1 minute.
05 - Add crushed tomatoes, dried basil, oregano, sugar, salt, black pepper, and optional red pepper flakes. Stir to combine and bring to a gentle simmer.
06 - Return meatballs to the skillet, nestling them into the marinara. Cover and simmer on low heat for 20 to 25 minutes, until meatballs are fully cooked and sauce has thickened.
07 - Adjust seasoning to taste. Garnish with fresh basil if desired and serve hot.