1 1/4 Stick Unsalted Butter (Softened) 1/4 Cup Powdered Sugar 1 1/2 Tablespoon Sugar 1/4 teaspoon salt 1 Cup plus 2 Tablespoons plus 2 teaspoons All-Purpose Flour 1/3 Cup Cornstarch (adding cornstarch makes the cookie crumbly) Position the rack in the middle of the oven. Preheat the oven to 300 degrees F. Sift the powdered sugar, sugar and...
