Preheat Oven: Preheat your oven to 375°F (190°C) and grease a muffin tin or mini loaf pan.
Mix Ingredients: In a large bowl, combine ground chicken, Parmesan, breadcrumbs, minced garlic, egg, milk, parsley, oregano, onion powder, salt, and pepper. Mix until just combined.
Shape Meatloaves: Divide the mixture evenly into the muffin tin or mini loaf pan, pressing gently to shape.
Bake: Place in the oven and bake for 20-25 minutes, until the meatloaves are golden and cooked through (internal temperature of 165°F/74°C).
Add Toppings: Remove from the oven, spoon marinara sauce on each meatloaf, and sprinkle with shredded mozzarella cheese.
Melt Cheese: Return to the oven for an additional 5 minutes, or until the cheese is melted and bubbly.
Serve: Carefully remove from the pan, garnish with extra parsley if desired, and serve warm.