Brown Sugar Chocolate Chip Shortbread Cookies

Ingredients (7)

• 1/2 pound (2 sticks) unsalted butter, at room temperature
• 1 cup packed light brown sugar
• 1/2 teaspoon kosher salt
• 1 1/2 teaspoons pure vanilla extract
• 2 1/4 cups unbleached all-purpose flour
• 1/2 cup finely chopped semisweet chocolate or semisweet mini chocolate chips
• Optional: 1/4 cup granulated sugar (for dusting if​ using a cookie stamp​)