Converting this Blueberry Buckle Coffee Cake into a gluten-free rendition is not only straightforward but also a wonderful way to accommodate everyone’s dietary preferences without renouncing taste or texture. To make it gluten-free simply supersede the all-purpose flour with a high-quality free flour blend that includes xanthan gum to replicate the desired texture and elasticity of gluten. When choosing your flour blend look for one that combines rice flour, potato starch and tapioca flour for a tender crumb that works perfectly for both the cake and crumble topping. Also, remember to use certified gluten-free baking powder and other ingredients to prevent any cross-contamination.