01 - Preheat oven to 350°F. Line a loaf pan with parchment paper or lightly grease it.
02 - In a large bowl, combine ground chicken, Parmesan, onion, garlic, breadcrumbs, eggs, milk, herbs, salt, and pepper. Mix until just combined—do not overmix.
03 - Transfer the mixture into the prepared pan, shaping it into a loaf.
04 - In a small bowl, stir together the tomato sauce, olive oil, and balsamic vinegar. Spread evenly over the top of the meatloaf.
05 - Sprinkle with additional Parmesan cheese, if desired.
06 - Bake for 45–50 minutes, or until the center reaches 165°F and the top is golden.
07 - Let the meatloaf rest for 10 minutes before slicing. Serve warm, garnished with fresh herbs if liked.