Surprise! This Classic French Dessert Is Actually Better When Made at Home

Name: Surprise! This Classic French Dessert Is Actually Better When Made at Home
Ingredients: 6 cups (1.4L) whole milk; 1 vanilla bean, split and scraped (see notes); 340g granulated sugar (12 ounces; about 1 1/2 cup plus 2 tablespoons); 90g cornstarch (3 ounces; 6 tablespoons); 3/4 teaspoon Diamond Crystal kosher salt; for table salt, use half as much by volume; Yolks from 12 large eggs, cold (about 7 1/2 ounces; 210g); 90g unsalted butter (3 ounces; 6 tablespoons), cut into 1/2-inch cubes; Three 14 1/2- by 9 1/2-inch sheets puff pastry from three 14-ounce packages frozen puff pastry, thawed, preferably all-butter (such as Dufour); 2 pounds (906g) dried beans or pie weights, for baking; Confectioners sugar, for dusting