Transform your Pecan Upside Down Bundt Cake into a gluten-free delight without sacrificing the soulful taste that makes it a favorite. Start by selecting a gluten-free yellow cake mix, which is readily available at most supermarkets, ensuring that the buttery base of your cake remains unchanged in flavor. For the pecan topping, confirm that your corn syrup and butter are gluten-free – most are, but it never hurts to check.