from Yasmine's Kitchen
125 g. butter, cold, cut into small cutes
1 1/2 cups flour
1/2 cup powdered sugar
1/2 tsp. salt
1 egg yolk, beaten with a drop of vanilla extract
1. Put flour, sugar, and salt in food processor and pulse to combine. Add butter, and pulse until texture is like coarse cornmeal.
2. Add egg yolk, and combine until dough seems less dry (don't wait for dough to come together, test to see if mixture comes together when you squeeze a pinch)
3. Butter a tart pan, and press in dough evenly, not pressing too hard. Cover with tin foil and freeze for 40 minutes or more.
4. Pre-heat oven to 375 F, and cook crust for 20-25 minutes not letting it brown. Let cool before using.