Sweet Tart Pastry

from Cook's Illustrated

1 large egg yolk
1 tbsp heavy cream
1/2 tsp vanilla
1 1/4 cup unbleached all-purpose flour
2/3 cup powdered sugar
1/4 tsp salt
8 tbsp unsalted butter

Whisk yolk, cream, and vanilla in a small bowl. Place dry ingredients in a food processor and pulse to combine. Scatter in butter and pulse to cut in. With machine running, add egg mixture and process till dough just comes together- about 12 seconds. Turn dough onto plastic wrap and press into 6" disc. Wrap in plastic and chill 2 hours (up to 48). Bring out for about 15 minutes. Unwrap dough and roll out between parchment paper or plastic wrap. Line the tart pan and chill 30 min to set. Back blind at 375 for 30 min.