Shortbread Cookies

Bahan-bahan (24 porsi)

• 250 g / 8 oz salted butter, softened (2 x US sticks, 1 cup) (or unsalted + ¼ tsp salt)
• 3/4 cup (90g) icing sugar (powdered sugar) ((Note 2))
• 2 cups (300g) plain / all purpose flour