Preheat oven to 375°F (190°C). Line a baking sheet with parchment paper.

In a small bowl, mix breadcrumbs and milk. Let sit for 5 minutes to form a panade.

In a large bowl, combine ground chicken, soaked breadcrumbs, eggs, 1/2 cup Parmesan, onion, garlic, Italian seasoning, salt, pepper, and parsley.

Mix gently with hands until just combined. Do not overwork the meat.

Transfer mixture to the baking sheet and shape into a 9x5 inch loaf.

Bake for 40 minutes.

Remove from oven. Top generously with marinara sauce and shredded mozzarella cheese.

Return to oven and bake for another 15-20 minutes until cheese is golden and internal temperature reaches 165°F.

Let rest for 10 minutes before slicing and serving.