Gluten Free Pie Crust

all purpose gluten free flour (My Better Than Cup4Cup Flour is best here), plus more for sprinkling

xanthan gum (omit if your blend already contains it)

baking powder

kosher salt

unsalted butter, diced and chilled (a 1/2-inch dice is best)*

to 1 1/3 cups (8 to 10 2/3 fluid ounces) cold water, iced (ice cubes do not count in volume measurement)

*For a dairy-free version, replace the unsalted butter with an equal amount, by weight, Spectrum brand nonhydrogenated vegetable shortening.