To make these Roasted Banana Bars gluten-free, substitute the cake flour with a 1:1 gluten-free all-purpose flour blend that includes xanthan gum. If your flour blend does not contain xanthan gum, add 1 teaspoon per cup of flour to ensure proper structure. All other ingredients are naturally gluten-free, but always verify labels for cross-contamination risks. Note that the texture may be slightly softer than traditional versions but still delicious.