Process the butter and the sugar in a food processor until pasty.
Add the egg and vanilla extract and process again.
Add the flour and process until a smooth dough is formed.
Press the dough together, shape it into a disk then wrap it with plastic wrap. Refrigerate for minimum of 30 minutes or overnight.
Roll the dough between two pieces of parchment paper. Remove the top piece and use the bottom one to gently press the dough into the tart pan.
Refrigerate for 20 minutes before removing the top piece and preheat the oven to 375F (190C) during this time.
Remove the top piece of parchment paper, trim the edges, and use a fork to prick the crust.
Top again with parchment paper, fill with pie weights or dry beans, and bake for 22-25 minutes.
Remove from the oven, and allow the crust to cool for 15 minutes before you remove the pie weights.