In a food processor, process the butter and sugar until you have a paste-like mixture.
Add the egg and vanilla extract and process until smooth.
Add the flour and process until you get a smooth dough.
Press the dough together into a dick then wrap it with plastic wrap and refrigerate for a minimum of 60 minutes, or overnight.
Roll the dough between two large pieces of parchment paper into a 10.5-inch circle.
Remove the top layer and use the bottom one to press the dough into a 9-inch (or 8) tart shell.
Place the tart shell back in the refrigerator to set before removing the parchment paper. Meanwhile, preheat the oven to 375F (190C) and place a baking pan at the center of the oven. Remove the tart from the refrigerator and peel off the parchment paper.
Trim the access dough and use a fork to prick the bottom of the dough.
Grease the parchment paper you just peeled and place or over the pastry, fill the shell with pie weights, dried beans, or rice, and bake over the baking sheet that is in the oven for 10-15 minutes for par-bake, or 20-25 minutes for fully baked.