In the bowl mix all-purpose flour and unsalted butter.
Add sifted powdered sugar, egg yolks, orange zest, pinch of salt and vanilla bean paste.
Mix with the paddle attachment until well incorporated.
Separate dough into 2-3 parts.
Each part of dough shape into log (salami looking) and cover with granulated sugar. Wrap tightly into plastic wrap. Twist ends of plastic wrap and chill in the refrigerator for 2-3 hours (or overnight).
Slice each log into 1/3-inch pieces and put into freezer for 15 min.
Preheat oven to 350F.
Bake at 350F for 16-18 minutes.
Cool cookies on the baking mat for 10-15 minutes then move on the cooling rock.