In a large bowl, beat eggs and stir in bread crumbs until combined. Stir in milk, onion, parsley, salt and mustard. Add meat and mix with hands until well blended. Roll into small meatballs and place into a large shallow baking pan (or broiler pan). Bake in 400F oven for 25 minutes or until browned. Let cool, then freeze in airtight containers or ziplock bags. Will keep in freezer for up to 6 months.