To make this Chocolate Chip Banana Bread gluten free, replace the all-purpose flour with a gluten-free 1:1 baking flour blend that is designed for baking quick breads. For best results, use a blend that already contains xanthan gum, or add xanthan gum according to the package directions if your blend does not include it. Also confirm that the baking soda, vanilla extract, and chocolate chips are certified gluten free, as some brands may contain additives or be subject to cross-contact during processing. If you are baking for someone with celiac disease or a strong gluten intolerance, make sure your loaf pan, mixing bowls, whisk, spatula, cooling rack, and work surfaces are thoroughly cleaned before preparing the batter.