In a large bowl, mix together the first 11 ingredients (ground chicken through the egg). With a small scoop, scoop out the mixture onto a parchment lined sheet pan.
Bake the meatballs in the oven for 15 minutes. Then pour over the tomato sauce and sprinkle over the Parmesan cheese. Return the meatballs to the oven and bake for 5-7 minutes more, or until the meatballs are cooked through and the sauce is bubbling.
Remove from the oven and let rest at least 5 minutes before serving.