Millionaire shortbread is one of my ultimate favourite treats: the combination of shortbread, caramel and chocolate is pretty special. This recipe is a Phil Vickery one that is gluten free, which makes a bit of a change (and you would never guess it's gluten free!)   I managed to get 24 squares out of the tray but it's totally dependent upon how large you want to make your shortbread; it's very rich (but very moreish!) so little squares make you feel less guilty about having more than one.         To make gluten free millionaire shortbread you will need:   Shortbread base  150g rice flour  55g caster sugar  115g butter   Caramel  150g butter  150g soft brown sugar  397g tin of condensed milk   Chocolate  200g chocolate (milk or dark - I love dark but it can be too intense for some people!)         Start by preheating your oven to 180C and greasing and lining a square tin.      The shortbread base involves you rubbing the butter into the rice flour and sugar until it rese...