I am using 9 inch tart pan.
Place the flour, sugar, and salt in the bowl of a food processor, stand mixer, or in a medium mixing bowl.
Pulse twice and add in the butter. Pulse 6 times and add in the vanilla extract, whipping cream and the egg, process/mix/stir until the dough gathers itself into a ball and pulls away cleanly from the sides of the bowl. Transfer in a plastic.
Wrap the dough tightly in plastic wrap, and chill for 1 hour.
On a lightly floured surface, roll the dough to a thickness of about 1/8-inch.
Press the dough gently into the tart pan and using your finger, spread dough on the side of the pan. Use the plastic to smoothen the dough.