Preheat the oven to 350°F and spray a 9×5×2-inch loaf pan with nonstick cooking spray.
In a large mixing bowl, combine ground chicken, Italian breadcrumbs, grated Parmesan cheese, minced yellow onion, minced garlic, egg, whole milk, 2 tablespoons chopped parsley, salt, and black pepper.
Use clean hands or a large spoon to mix until the ingredients are well combined.
Form the meat mixture into a loaf, and place it into the prepared loaf pan. Top with shredded parmesan cheese and the remaining 1 tablespoon of fresh chopped parsley.
Bake in the preheated oven for 1 hour.
Broil for the last 2 minutes to get the top golden brown. Watch it closely!
Notes
Serve warm. Consider using fresh herbs for garnish.