Ingredients

• 1 1/3 cups (2 sticks plus 6 tablespoons) unsalted butter, room temperature, plus more for pans
• 2/3 cup sugar
• 3/4 teaspoon salt
• 3/4 teaspoon pure vanilla extract
• 3 1/3 cups all-purpose flour

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Instructions

1. Preheat oven to 275 degrees F. Butter a 9-by-13-by-1-inch baking pan, and line bottom with parchment paper. In the bowl of an electric mixer fitted with the paddle attachment, cream butter and sugar on medium speed until light and fluffy, about 2 minutes. Add salt and vanilla, and beat to combine. Add flour, 1 cup at a time, beating on low speed until just combined. Press dough into prepared pan, leveling and smoothing the top. Using a dough scraper or the back of a knife, cut dough lengthwise into nine strips slightly less than 1-inch wide. Cut the strips crosswise into 36 (3-inch) bars. Using the tines of a fork or a wooden skewer, create a decorative pattern on the surface. Bake shortbread until evenly pale golden, but not browned, 70 to 85 minutes. Transfer pan to a wire rack to cool. Invert pan, and remove parchment. Turn shortbread over, and carefully break, or cut with a serrated knife, into bars. Store in an airtight container for up to 1 month.;