01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or lightly grease it with olive oil.
02 - In a large mixing bowl, combine the ground turkey, basil pesto, grated Parmesan, breadcrumbs, egg, minced garlic, grated onion, kosher salt, and black pepper. Mix gently with your hands or a spoon until all ingredients are evenly incorporated, being careful not to overwork the meat.
03 - Using damp hands or a cookie scoop, portion the mixture and roll into 16 to 18 uniform meatballs. Place them on the prepared baking sheet with even spacing between each one.
04 - Lightly brush or drizzle the tops of each meatball with olive oil to promote even browning and a golden crust during baking.
05 - Bake on the center rack for 18 to 20 minutes, or until the meatballs are cooked through with an internal temperature of 165°F and have developed a light golden-brown exterior.
06 - Remove from the oven and let rest briefly. Serve warm, garnished with additional pesto, torn fresh basil leaves, and a sprinkle of grated Parmesan if desired.