Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a mixing bowl, cream together the unsalted butter, powdered sugar, and granulated sugar until light and fluffy, about 2-3 minutes.

Add the orange zest and vanilla extract to the creamed mixture and mix on low speed until combined.

Gradually add the all-purpose flour and salt, stirring gently until a dough forms without overmixing.

Shape the dough into 1-inch balls and place them on the baking sheet, flattening each ball slightly.

Bake the cookies for 12-15 minutes until the edges are lightly golden and the centers soft.

Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

Dust the cooled cookies with extra powdered sugar for a lovely finish before serving.