An indulgent millionaire's shortbread recipe, that's also gluten free. The classic recipe has a gluten free shortbread base, syrupy caramel and a naughty double chocolate topping. Since there is no reliance on gluten like with bread and pasta, I've found gluten free flour works really well as a like for like replacement in shortcrust pastry and most crumbly, biscuit like recipes. without further ado, let's get baking!