Shortbread Buttons

• 8 tablespoons unsalted butter (1 stick)
• ¼ cup brown sugar

Preheat the oven to 250°F.

Put the butter, brown sugar, and salt in the bowl of an electric mixer with a paddle attachment and beat on medium speed for 10 minutes.

Add the sifted pastry and bread flours, and mix until combined. Scrape down the bowl and the paddle, and m