1-First Step: Prepare Ingredients and Equipment
Begin by gathering and measuring all ingredients precisely: 10 tablespoons of softened unsalted butter, 1/2 cup confectioners’ sugar, 1/2 teaspoon vanilla extract (optional), 1 1/2 to 2 cups all-purpose flour, and 1/2 teaspoon kosher salt if using unsalted butter. Set up your stand mixer fitted with the paddle attachment. Line a baking sheet with parchment paper or a silicone baking mat to prevent cookies from sticking during baking.

2-Second Step: Cream Butter and Sugar
Place the softened butter and vanilla extract into the mixer bowl. Beat on medium speed until creamy and smooth, around 2-3 minutes. Gradually add the confectioners’ sugar and salt, continuing to beat until fully incorporated. This step creates the rich base blending fat and sweetness, which is essential for the perfect shortbread texture.

3-Third Step: Incorporate Flour to Form Dough
Reduce mixer speed to low and slowly add all-purpose flour, starting with 1 1/2 cups and adding more if necessary. Mix until the dough forms a crumbly yet cohesive mass. If the dough is too crumbly to hold, gently warm it with your hands to help it bind together. At this point, for gluten-free modifications, swap in your preferred gluten-free flour blend following the same process.

4-Fourth Step: Shape and Chill Dough
Turn the dough out onto a lightly floured surface. Shape it into a rectangular prism or ball depending on your preferred cookie shape. Wrap tightly with plastic wrap and refrigerate for at least one hour. Chilling firms the dough, which helps the cookies retain shape while baking and improves texture. The dough can also be refrigerated up to one week or frozen for up to one month for make-ahead convenience.

5-Fifth Step: Roll and Cut Dough
Preheat your oven to 325-350°F (163-177°C). Roll the chilled dough between sheets of parchment paper to about 1/3 to 1/2 inch thickness. Cut the dough into 1/2 inch thick slices or desired shapes such as 3-inch circles, rectangles, or festive forms. Alternatively, roll dough into small balls and flatten gently with a glass or fork for classic shortbread cookies. Pro tip: Use fork tines or a skewer to create decorative indentations on top for a charming presentation.

6-Sixth Step: Bake the Cookies
Arrange cookies on the prepared baking sheet, spacing them at least an inch apart to allow slight expansion. Bake for 10-15 minutes, rotating the baking sheet halfway for even color. Watch the bottom edges carefully they should turn pale golden brown when done. Baking time may vary slightly depending on your oven and cookie thickness.

7-Final Step: Cool and Store
Remove cookies from the oven and transfer to a wire rack to cool completely. This prevents sogginess and preserves the crumbly texture. Store cooled cookies in an airtight container at room temperature for up to 5 days or refrigerate up to 10 days. For longer storage, freeze baked cookies in freezer-safe containers for up to three months. Reheat briefly in a low oven before serving for a fresh-baked feel.