In a large bowl, combine the first 10 ingredients. Crumble meat over mixture and mix well. Shape into 1-in. balls (about 6 dozen). , Place meatballs on greased racks in shallow baking pans. Bake at 400° for 20 minutes or until a thermometer reads 160°., In a large skillet, prepare gravy mix according to package directions. Add half of the meatballs; cover and cook for 10 minutes or until heated through. Remove from the heat; stir in the sour cream, nutmeg and pepper. Serve with noodles.