Snickerdoodle cookies and sugar cookies are similar in a lot of ways, but they are different! Snickerdoodle cookies vary from classic sugar cookies in that they are made with cream of tartar and brown sugar for a softer, chewier texture and a subtle tangy flavor. They are also traditionally rolled in cinnamon and sugar before they're baked. Classic sugar cookies are made with just granulated sugar and don't require cream of tartar.