• ½ cup (1 stick/114 grams) unsalted butter, at room temperature, cut into 8 pieces

Using a stand mixer fitted with the paddle attachment, cream together the butter, sugar, and salt on medium speed for 2 to 3 minutes, or until pale and light. Scrape the sides and bottom of the bowl with a rubber spatula. Add the flour and beat on low speed for about 30 seconds, or until the flour mixes with the butter-sugar mixture. The mixture will look like wet sand. Add the egg yolk and con