To make these Rich Gooey Pecan Pie Bars gluten-free. Simply substitute the yellow cake mix. With a gluten-free alternative. Many gluten-free cake mixes work just as well. And will still give you that soft, cake-like crust. Be sure to double-check all your other ingredients. Especially the butter and cream. To make sure they’re gluten-free too. You can enjoy all the gooey, nutty goodness of this dessert. Without the gluten!