01 - In a large mixing bowl, combine the ground turkey, breadcrumbs, grated Parmesan cheese, egg, minced garlic, finely chopped onion, chopped parsley, dried oregano, salt, black pepper, and milk. Mix gently with your hands until just combined, taking care not to overmix the ingredients.
02 - Divide the mixture and form into 16 golf ball-sized meatballs.
03 - Heat 1 tablespoon of olive oil in a large skillet over medium heat. Carefully place meatballs in the skillet in batches to avoid crowding. Brown the meatballs on all sides, turning occasionally, for approximately 5 minutes.
04 - If necessary, carefully drain any excess oil from the skillet. Return all browned meatballs to the skillet.
05 - Pour the marinara sauce over the meatballs. Stir in the dried basil and red pepper flakes. Gently stir to ensure all meatballs are coated evenly with the sauce.
06 - Cover the skillet and reduce heat to low. Simmer for 20 to 25 minutes, or until the meatballs are thoroughly cooked through and reach an internal temperature of 165°F (74°C).
07 - Taste the sauce and adjust salt and pepper as needed. Serve the meatballs hot, optionally garnished with additional fresh parsley and grated Parmesan cheese.