In a bowl mix together with your hands the ground chicken, bread crumbs, Parmesan cheese, egg, 1/2 cup marinara sauce and Italian seasoning until well combined.
Place meat mixture in the bottom of either a casserole crock-pot or a 5 quart or larger oval crock pot and shape into a loaf shape.
Pour the remaining 1/2 cup of marinara sauce over the top.
Cover and cook for 4 – 6 hours on LOW or 2 – 3 hours on HIGH.
During last 10 minutes of cooking sprinkle mozzarella cheese over top and cover again to let cheese melt.
Serve with a nice Caesar salad and some crusty bread for an easy meal and enjoy!