• Line 2 baking sheets with parchment paper.
• In a large bowl, using a hand held electric mixer, beat the butter with the powdered sugar until very smooth, about 2 minutes. Beat in the orange zest and juice, then beat in the flour and salt until just combined.
• Cover the bowl with plastic wrap and chill in the fridge for an hour.
• Roll the dough into 1-1½ inch balls. Place them 1 inch apart on the prepared baking sheets. Gently flatten each cookie with your fingers or a small glass dipped in flour. Chill the cookies while the oven is pre-heating at 350F (180C). Bake for 12-14 minutes or until the cookies are lightly browned on the bottom and just firm.
• Let the cookies cool on the baking sheets for 2 minutes, then transfer them to a wire rack to cool completely.

Orange Glaze

• In a bowl, whisk together the powdered sugar with the orange zest, orange juice and butter until smooth. Add more powdered sugar or juice to make the mixture thick enough to your liking. Make sure the glaze is not runny.
• Spread the orange glaze on the cooled cookies and garnish with more finely grated orange zest if desired. Let stand until the glaze has set, about 15 minutes. Enjoy!