I used unbleached cake flour and I reduced the sugar to 1 / 4C organic white sugar and 1 / 2c organic brown sugar. (smittenkitchen.com)
1/2 c almond meal 3/4 c gluten - free flour blend 1/4 c sweet rice flour (white rice will work as well) 1/4 c cornstarch 1/4 tsp sea salt 1/2 tsp xanthan gum 1 1/2 sticks (3/4 cup) unsalted butter, softened 1 cup plus 2 tablespoons organic white sugar 1 large egg 1 1/2 tablespoons freshly grated lemon zest (use a microplane for this) (redtri.com)