CHOCOLATE PEANUT BUTTER SHORTBREAD SQUARES

Steps:

• Coat a 9 1/2-inch square baking pan with cooking spray. Line with parchment, leaving a 2-inch overhang on 2 sides, and coat parchment with spray.
• Sift flour and salt into a medium bowl. Beat butter with a mixer on medium-high speed until fluffy, 3 to 5 minutes. With the mixer running, add sugar, and beat until pale and fluffy, about 2 minutes. Reduce speed to low. Add flour mixture, beating until just incorporated. Press dough evenly into pan. Cover, and refrigerate until firm, about 20 minutes.
• Preheat oven to 300 degrees. Bake shortbread until golden brown and firm in center, 45 to 50 minutes. Let shortbread cool in pan on a wire rack.
• Place a basket-weave mat, trimmed to fit pan, on a rimmed baking sheet, and spread melted chocolate evenly on mat. Refrigerate until firm, about 45 minutes.
• Use parchment to unmold shortbread from pan, and trim edges to create a square. Spread peanut butter evenly on shortbread. Carefully center chocolate, mat side up, on top of peanut butter, and gently peel off mat. Cut shortbread into 1 1/2-inch squares. Shortbread will keep, covered, for up to 3 days.