Preheat Oven and Prep Pan:
Set oven to 375°F (190°C). Coat a 9x5-inch loaf pan with oil or line with parchment.Mix Meatloaf Ingredients:
In a large bowl, mix ground chicken, breadcrumbs, Parmesan, egg, milk, garlic, onion, parsley, Italian seasoning, salt, and pepper. Stir gently until blended—avoid overworking.Shape Loaf in Pan:
Place the mixture into the prepared pan. Press evenly to form a uniform loaf.Bake Meatloaf:
Cook for 40–45 minutes, until the loaf is almost done.Add Toppings and Finish Baking:
If adding toppings, brush marinara over the top and cover with mozzarella. Bake another 10–15 minutes, until internal temp hits 165°F (75°C).Rest Before Slicing:
Allow the meatloaf to rest 5–10 minutes prior to slicing. Top with extra parsley and Parmesan if desired.