In a large bowl mix butter with powdered sugar and salt until light and fluffy.
Add egg and continue mixing until well combined and creamy.
Incorporate the flour into the butter mixture until combined. Make sure you don’t overwork the dough.
Wrap the dough with plastic wrap, form into a disc and refrigerate for at least 30 minutes.
Preheat the oven to 350F (180C).
Roll the dough between two pieces of parchment paper or plastic wrap until it's about 13in (33cm) in diameter.
Press the dough onto the bottom and edges of a 9-inch (23cm) tart pan.
Crimp the edges of the dough.
Refrigerate for about 30 minutes before baking.
Line a parchment paper over the crust and fill with dry beans, rice or pie weights.
Bake for 20 minutes. Remove the weights and the parchment paper.
Return to the oven for another 10 minutes. If the edges brown too quickly, cover the edges with a tart shield or aluminum foil shield.
Let it cool slightly on a cooling rack.
Reduce the heat to 325ºF (160C).