To Make This Recipe Gluten-Free: Replace the cake flour with a high-quality gluten-free 1:1 baking flour blend that contains xanthan gum. If your blend doesn’t already include it, add 1 teaspoon of xanthan gum per 2 1/2 cups of flour. The cake’s texture will remain soft and tender, although the structure may be slightly more delicate. Handle the cooled layers with care during assembly.