01 - In a large mixing bowl, combine the ground turkey, breadcrumbs, grated Parmesan cheese, large egg, minced garlic, chopped onion, fresh parsley, dried oregano, 1/2 teaspoon salt, 1/4 teaspoon black pepper, and milk. Gently mix with your hands until just incorporated, being careful not to overmix.
02 - Divide the mixture and roll into 16 golf ball-sized meatballs.
03 - Heat 1 tablespoon of olive oil in a large skillet over medium heat. Working in batches, brown the meatballs on all sides for approximately 5 minutes until golden.
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.
06 - Cover the skillet and simmer on low heat for 20 to 25 minutes, or until the meatballs are thoroughly cooked, reaching an internal temperature of 165°F.
07 - Taste the marinara sauce and adjust seasoning with additional salt and pepper as desired. Serve the meatballs hot, optionally garnished with fresh parsley and grated Parmesan cheese.