New Twix Dark Cookie Bars from Mars. If you love Twix and you love Dark Chocolate - well then this is a match made in Heaven. The Twix cookie bar covered in caramel and then now in Dark Chocolate. If you have never had TWIX before but you love dark chocolate then try a package or two or three, or add a few packages to your order. At these prices you can't go wrong. Each package is 1.79oz.