1. Preheat the oven to 180°C (350°F). Line a baking sheet with baking parchment and set aside.

2. Add the butter, confectioners‘ sugar, and orange zest to a large bowl and mix until light and fluffy. Add the polenta and flour and mix until just combined. Place the dough on a lightly floured surface and roll out to a rectangle with a thickness of about 0.2 inches (5mm). Cut into 1.6×2.4 inches (4x6cm) rectangles and place those rectangles with some space in between on the prepared baking sheet (roll out the remaining dough again). Prick the biscuits several times with a fork.

3. Bake the cookies for about 12-14 minutes or until lightly golden in color. Take out of the oven and sprinkle with the sugar, let cool down a bit on the baking sheet, then transfer to a wire rack to cool down completely.