Using a food processor, mix together flour, powdered sugar, and salt.
1 ¾ cups all purpose flour, ½ cup powdered sugar, ¼ teaspoon salt
In a separate bowl, whisk together egg and egg yolk, lemon zest, butter, and vanilla extract.
½ cup salted butter, melted, 1 large egg + 1 yolk, 1 teaspoon lemon zest, ½ teaspoon vanilla extract
Add egg mixture to food processor and pulse just until the crust sticks together when pressed between fingers.Remove dough from the food processor and form into a flat disc, about 1″ thick. Wrap in plastic wrap and chill in the refrigerator for 30 minutes.
On a lightly floured surface, roll out dough. Press dough into tart pan, making sure to press it into the edges as well.
Line crust with parchment paper and press into “corners” and sides well. Then, fill the parchment-lined crust with weights.
Chill in refrigerator for another 30 minutes. In the meantime, preheat oven to 375°.
Then, bake the crust for 25 minutes (leave the pie weights in place) until edges start to brown.
Remove from oven, carefully scoop out pie weights, and let crust cool.