Preheat your oven to 350°F and line a baking sheet with parchment paper.
In a large bowl, cream the softened butter with 0.5 cup of powdered sugar until fluffy. Add vanilla and mix well.
In another bowl, combine flour and dry pistachio pudding mix. Gradually add this to the butter mixture until a dough forms. If using, fold in chopped pistachios until evenly distributed.
Form the dough into a ball, wrap it in wax paper, and refrigerate for 1 hour.
Scoop teaspoon-sized balls of dough, slightly flatten them, and place them on the prepared baking sheet.
Bake in the preheated oven for 6 to 9 minutes, until the edges are lightly golden. Let cool on the baking sheet for 3 to 5 minutes.
Roll warm cookies in the remaining 0.75 cup powdered sugar and place on a wire rack to cool completely.
Once cooled, store cookies in an airtight container. Enjoy!
Notes
These cookies are delicate and melt in your mouth. Perfect for weddings or any special celebration!