In a mixing bowl add butter and confectioners sugar along with salt.
Using an electric beater, cream the butter and sugar on low speed.
Add vanilla extract and orange zest. Mix well using a silicon spatula.
Next add flour. Mix well using the spatula.
As the flour begins to combine with the butter mixture, add slivered almonds. Mix it well.
Bring the dough together and place it on a parchment paper or cling film.
Roll it tightly into a log or rectangle. Store it in freezer for atleast 30 mins. The dough can be preserved for upto 3 months in the freezer.
Preheat the oven at 160°C for 15 mins. Remove the dough from freezer. Slice it into cookies of thickness half centimeter.
Place them on a baking sheet lined with parchment paper one inch apart.
Bake the cookies at 160°C for 20mins and 5 mins on toast mode until the bottom is golden brown. Let the cookies cool down for 5 mins and then transfer them to a wire rack.
Store in an airtight container and serve with coffee/tea!