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