In a large mixing bowl, combine the gluten-free flour blend, salt, and xanthan gum.
Cut in the cold butter using a pastry cutter or fork until the mixture resembles coarse crumbs.
Slowly add cold water, mixing until a dough forms.
Transfer the dough to a floured surface and knead gently.
Roll out the dough into a rectangle, fold it into thirds, then chill for 30 minutes.
Repeat the rolling and folding process two more times, chilling in between.
Preheat the oven to 375°F (190°C).
Roll out the dough one final time to the desired thickness and shape.
Use as needed for pastries, pies, or turnovers.