Combine Dry Ingredients: In a high-speed food processor, add flour and powdered sugar. Pulse a couple of times to blend them together.
Add Butter: Add the chilled cubed butter, pulsing for about 15 seconds until the mixture resembles coarse crumbs.
Incorporate Egg Yolk: With the processor running, add the egg yolk through the feed chute and pulse until combined, about 5-10 seconds.
Add Water: Drizzle in water 1 tablespoon at a time, pulsing until the dough comes together.
Knead and Chill Dough: Transfer the dough to a floured board or countertop. Gently knead and form into a disc. Chill in the fridge for 30 minutes.
Prepare Pan and Oven: Preheat the oven to 356ºF (180ºC). Grease a 24cm tart pan with a removable base with butter and set aside.
Roll and Fit Dough: Roll out the dough slightly larger than the tart pan, about 3-4mm in thickness. Transfer and fit into the pan, trimming any excess.
Prick Base: Lightly prick the base of the dough with a fork, not going all the way through. Line the crust with a sheet of parchment paper and fill with pie weights or uncooked rice or beans.
Blind Bake: Bake for 15 minutes, then remove weights and paper, and continue baking for an additional 12-14 minutes until lightly golden.
Cool: Remove from the oven and let cool in the tin for 10 minutes. Then, remove from the tin and transfer to a wire rack to cool completely.