01 - Preheat the oven to 350°F. Line a loaf pan with parchment paper or lightly grease it with cooking spray.
02 - In a large mixing bowl, combine the ground chicken, Parmesan cheese, diced onion, minced garlic, breadcrumbs, eggs, milk, Italian herbs, salt, and pepper. Gently fold everything together until just incorporated—avoid overmixing to keep the texture tender.
03 - Transfer the mixture into the prepared loaf pan, pressing gently to fill the corners and smoothing the top into an even layer.
04 - In a small bowl, whisk together the tomato sauce, olive oil, and balsamic vinegar. Spread the glaze evenly across the top of the meatloaf.
05 - Sprinkle an additional layer of grated Parmesan cheese over the glaze for a golden, savory crust.
06 - Bake on the center rack for 45 to 50 minutes, or until the internal temperature reaches 165°F and the top is deeply golden.
07 - Remove from the oven and let the meatloaf rest in the pan for 10 minutes before slicing. Serve warm, garnished with fresh herbs if desired.