Preheat oven to 350°F. Line a baking sheet with parchment paper.
In a large mixing bowl, combine the first 10 ingredients. Combine well but don't over mix. Roll chicken mixture into 1" meatballs and place onto baking sheet. Bake for 16-18 minutes until lightly browned.
Spoon about one tablespoon marinara sauce over each meatball. Place a small thin slice of mozzarella on top of each meatball.
Return to oven and cook for about 5 minutes or until cheese is melted.