The Classic French Dough I Use to Make All My Tarts

Name: The Classic French Dough I Use to Make All My Tarts
Ingredients: Nonstick cooking spray; 250g all-purpose flour (8 3/4 ounces; 2 cups), sifted, plus more for dusting; 125g confectioners’ sugar (4 1/2 ounces; about 1 cup and 2 tablespoons), sifted; 50g blanched almond flour (1 3/4 ounces; 1/2 cup), sifted (see notes); 1/4 teaspoon Diamond Crystal kosher salt; for table salt, use half as much by volume; 125g unsalted butter (4 1/2 ounces; 9 tablespoons), cold and cut into 1/2-inch cubes; 50g beaten egg (1 3/4 ounce; 3 tablespoons), from 1 large egg