Cube butter.
Mix flours, sweetener, and salt in a bowl.
Add the cooled and cubed butter.
Mix the ingredients using a pastry cutter or your hands mix the ingredients until crumbly.
Add 2 tablespoons water and stir to combine.
Add remaining water and knead to make a soft buttery dough.
Wrap dough in plastic wrap. Refrigerate for 1 hour to firm the dough and make it easier to work with. This isn't necessary but is preferred.
Preheat oven to 375F.
Line pie pan with parchment paper (if desired).
Place dough in pan and using your hands, press until the dough is evenly distributed in the pie pan.
Carefully remove the edges and prick the bottom of the pie a few times with the tines of a fork.
If par-baking, bake the pie crust in the preheated oven for 15 - 20 minutes or until golden brown.
Remove from oven and let cool.