Food & Cooking Recipes Dessert & Treats Recipes Cookie Recipes Shortbread Triangles Be the first to rate & review! By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on May 6, 2020 Print Rate It Share Share Tweet Pin Email Photo: Marcus Nilsson Prep Time: 30 mins Total Time: 1 hrs 40 mins Yield: 32 Ingredients 2 cups all-purpose flour 1 ¼ teaspoons coarse salt 2 sticks unsalted butter, room temperature, plus more for pan ¾ cup confectioners' sugar Directions Preheat oven to 300 degrees. Whisk together flour and salt in a bowl. In another bowl, beat butter on medium-high speed until fluffy, 3 to 5 minutes. Gradually add sugar, beating until combined; continue to beat until mixture is very pale, about 2 minutes more. Reduce speed to low; beat in flour mixture. Place dough on a piece of parchment and shape into a rectangle. Top with a piece of plastic wrap and roll out slightly less than 1/4 inch thick. Trim to a 10-by-12-inch rectangle. Transfer dough and parchment to a baking sheet. Refrigerate until firm, about 20 minutes. Cut into quarters lengthwise, then crosswise into quarters to create smaller rectangles. Cut rectangles on diagonal, creating triangles. Pierce all over with a skewer. Bake until firm in centers and golden brown, 45 to 50 minutes. Transfer sheet to a wire rack; immediately recut triangles with a paring knife. Let cool completely. Shortbread can be stored up to 1 week. Rate it Print