I want to make the Cauliflower Cake in Plenty More gluten free. Does the gluten free flour mix need xanthum gum?

Here’s a long blog post and recipe for adapting the cauliflower cake from Plenty More to be gluten free. She doesn’t specify what sort of flour mix, but I’d guess that if you have one that specifies a 1:1 replacement for wheat flour, you’ll be fine. https://glutenfreegirl.com/2015/04/gluten-free-cauliflower-cake/