Make the Dough: Add flour, sugar, and salt to a food processor. Pulse once or twice to mix them. Add the butter. Pulse for 5-6 one second pulses, so that the butter is cut up without large chunks. Add the egg yolk, heavy cream, and vanilla. Process in 2-3 10 second pulses.
Watch for the dough to ball up and come together and stop once it has. If it still looks dry, add one more tablespoon of cream and pulse a few times to mix it in.
Chill the Dough: Once the dough has begun to come together, transfer the dough to a bowl and use your hands to shape it into a disc.
Cover the disc with plastic wrap and let chill for 1-2 hours, or up to 3 days. If chilling more than 1 hour, let the dough warm up and become pliable before rolling. This may take up to 30 minutes.
Roll the Dough: Take out a 9 inch tart pan. Before rolling out the dough, butter a the pan.
Roll out the dough on a floured board until it is large enough to fit the pan. Once the dough is pressed into the pan, use the rolling pin over the top the tart pan to neatly cut the edges.
Press holes into the dough all over the surface with a fork. Freeze the dough in the pan for 30 minutes.
Heat oven to 325F.
Blind Bake the Crust: Line the frozen dough with foil and fill with pie weights.
Bake the crust for 30 minutes, or until light brown. Remove the baked crust from the oven, take off the pie weights and let cool while you make the filling.