Preheat oven to 350 degrees. Lightly grease a meatloaf pan or sheet pan. (I usually put parchment paper on the sheet pan to free form the meatloaf.)
In large bowl, place ground chicken, egg, bread crumbs, onion, parmesan cheese, milk, and all seasonings. Mix until well combined. (Don't over mix)
Place mixture into pan and shape into a loaf.
Pour pasta sauce over meatloaf.
Bake for 50 minutes or until internal temperature of 165 degrees is reached.
Take out of oven and place mozzarella cheese on top of the sauce. Place back in oven for 5 minutes or until cheese has melted.
Sprinkle with fresh parsley, if desired. Enjoy.