Scottish Shortbread
["1 lb. butter, softened", "1 c. sugar", "2 tsp. vanilla extract", "3 c. all-purpose flour", "1/2 c. cornstarch"]
["Place softened butter in a large mixing bowl.", "Beat at medium speed with an electric mixer until creamy.", "Gradually add sugar, beating well.", "Stir in vanilla extract.", "Combine flour and cornstarch; gradually add to butter mixture, beating at lowest speed after each addition.", "Press into a 15 x 10 x 1-inch jellyroll pan.", "Bake at 350\u00b0 for 15 minutes.", "Reduce heat to 325\u00b0 and bake 20 additional minutes or until top is lightly browned. Cool in pan 5 minutes on a wire rack; cut shortbread into 1 inch squares.", "Store in an airtight container", "at room temperature up to 1 week or freeze up to 3 months.", "Yield: 12 1/2 dozen."]
["butter", "sugar", "vanilla extract", "all-purpose", "cornstarch"]