Gluten Free Cinnamon Sugar Biscuits

For the Biscuit Dough 2 cups (280 g) all-purpose gluten free flour (I like Better Batter or my mock Better Batter here)*, plus more for sprinkling

xanthan gum (omit if your blend already contains it)

nonfat dry milk (blended into a fine powder)

cornstarch

baking powder

baking soda

kosher salt

unsalted butter, cut into large chunks and chilled

cup (8 fluid ounces) milk (any kind, just not nonfat), chilled

*In place of the mock Better Batter + nonfat dry milk + cornstarch, you can use 2 1/2 cups (350 g) Cup4Cup gluten free flour, or my mock Cup4Cup blend.

For the Cinnamon Sugar Cold water, for brushing

granulated sugar

ground cinnamon

kosher salt