01 - Combine ground turkey, egg, breadcrumbs, minced garlic, grated onion, chopped parsley, oregano, salt, pepper, and Parmesan in a large bowl. Mix gently until just incorporated, avoiding overworking the meat.
02 - Form mixture into 16 uniform meatballs, approximately 1 inch in diameter. Maintain consistent sizing for even cooking.
03 - Heat 2 tablespoons olive oil in a large skillet over medium heat. Brown meatballs in batches, turning to sear all sides evenly for 6-8 minutes until cooked through. Alternatively, arrange on a lined baking sheet and bake at 400°F for 15-18 minutes, turning once midway.
04 - Heat 1 tablespoon olive oil in a separate skillet over medium heat. Add minced garlic and sauté for 30 seconds until fragrant. Add spiralized zucchini and toss gently for 2-3 minutes until just tender-crisp. Season with salt and freshly ground pepper.
05 - Portion zucchini noodles onto serving plates. Arrange meatballs on top and spoon warm marinara sauce over both. Garnish with additional grated Parmesan and fresh basil leaves as desired.