Start by measuring out all your ingredients. This makes the baking process smoother and ensures you don’t forget anything.
Preheat your oven to 350°F (175°C). Line your baking sheets with parchment paper to avoid sticking.
In a large mixing bowl, cream the 1 ½ cups of softened unsalted butter with 1 cup of powdered sugar until light and fluffy. This process usually takes about 2-3 minutes with an electric mixer.
Mix in the tablespoon of vanilla extract. Gradually add the 3 cups of all-purpose flour, 2 cups of finely ground pistachios (or almonds), and 1 teaspoon of salt. Stir until the mixture is well combined, but be careful not to overmix.
Using your hands, form small balls of dough, about 1 inch in diameter. Place them on the prepared baking sheets, leaving some space between each cookie as they will spread slightly.
Bake in the preheated oven for 15-20 minutes, or until the edges are lightly golden. Keep an eye on them to prevent over-baking, as you want them to remain soft and tender.
Once baked, remove the cookies from the oven and let them cool on the baking sheet for about 5 minutes. Then, transfer them to a wire rack to cool completely. After they are cool, roll them in the remaining powdered sugar until well coated.