In a medium size bowl, mix flour, sugar, xanthan gum & salt.
Slice chilled butter into 1/4” pieces & add into mixture.
Press butter chunks flat.
Mix butter into flour mixture until small pebbles form.
NOTE: I find it easiest to use my hands, but you could also use a pastry cutter or cheese grater to get small chunks of butter incorporated into the flour mixture.
Using your hands, mix in 1/4 cup ice cold water. Keep mixing until your dough comes together and only small pebbles of dough remain possibly loose, but no fluffy flour remains.
NOTE: You may need to add an extra tsp of water, but do not over hydrate. Your dough may seem crumbly, but no loose flour should remain.
Turn your dough onto lightly floured plastic wrap and use the plastic wrap to help shape it into a rectangle.
NOTE: If your dough is starting to get sticky from the butter melting, wrap in plastic wrap and refrigerate for 15 minutes.
Sprinkle flour on top of dough & place another layer of plastic wrap or parchment paper on top.
Press or roll dough out to about 1" thick.
Fold in half & repeat previous step.
Roll & fold 6 times. (This is called lamenting the dough & is what will give a flaky pie crust.)
Lightly sprinkle dough with flour if it is sticking to the plastic wrap or parchment paper. You can even get a new sheet if too much dough has stuck.
After folding and rolling 6 times, form a wheel of dough, wrap in plastic wrap & refrigerate for about 30 minutes.
Remove the dough from the fridge & place on a floured piece of plastic wrap or parchment paper.
Place an additional piece of plastic wrap or parchment paper on top of dough for rolling.
Roll dough out to about 1/8" thickness in a circle.
Remove the top plastic wrap.
Using the bottom plastic wrap to assist, flip the crust into the pie plate. Trim any excess crust from the edges & form the crust into the pie plate.
Brush any exposed edges of crust with cream (you can also use an egg wash).