Cake Mix Cookie Bars 05.19 Edit My family are huge fans of these cake mix cookie bars. These are soft gooey cookie bars made with moist yellow cake mix, and have chocolate chips and M&M's! Share this post Related PostsChewy Chocolate-Espresso CookiesNo-Bake Circus Animal Cookie TrufflesTraditional Scottish Shortbread12 Shortbread Recipes Perfect for the Holidays