Melinda's Gluten Free Choc Walnut Slice

Ingredients : icing sugar mix ( sugar , maize starch ) , gluten - free self -raising flour ( maize starch , tapioca starch , soy flour , rice flour , raising agents ( 575 , 501 ,500 ) ) , sugar , dessicated cocnut ( coconut preservative (223)) , coca powder (9%) , walnuts (6.3% ) , flavour