Place the ground meats, bread crumbs, parsley, Parmesan, salt, pepper, nutmeg, egg, and 3/4 cup warm water in a bowl. Combine very lightly with a fork. Using your hands, lightly form the mixture into 2-inch meatballs. You will have 14 to 16 meatballs.
Preheat oven to 400F. Place meatballs 1-2 inches apart on a foil lined baking sheet and bake for 20-25 minutes.