Gluten Free Snowball Cookies

all purpose gluten free flour (I like Better Batter here)

xanthan gum (omit if your flour blend already contains it)

cornstarch

confectioners’ sugar, plus more for dusting

kosher salt

+ 1 tablespoon (90 g) finely chopped raw pecans and/or almonds

unsalted butter, at room temperature

pure vanilla extract

Lukewarm water, by the teaspoonful as necessary