Preheat your oven to 350°F (175°C).
In a large mixing bowl, cream together the softened butter and powdered sugar until light and fluffy.
Add the vanilla extract and mix until combined.
Gradually add the flour and salt, mixing until just incorporated.
Fold in the chopped pistachios until evenly distributed.
Scoop tablespoon-sized portions of dough and roll them into balls.
Place them on a baking sheet lined with parchment paper, spacing them about 2 inches apart.
Flatten each ball slightly with the bottom of a glass.
Bake for 12-15 minutes, or until the edges are lightly golden.
Remove from the oven and let cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.