01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the gluten-free flour, baking powder, and salt. Set aside.
03 - In a large bowl, beat the softened butter and granulated sugar together with an electric mixer until light and fluffy, about 2–3 minutes.
04 - Add the eggs, one at a time, mixing well after each addition.
05 - Mix in the lemon zest, lemon juice, and vanilla extract until combined.
06 - Gradually add the dry ingredients to the wet mixture, mixing on low until just incorporated.
07 - Fold in the chopped pistachios.
08 - Cover the dough and refrigerate for 30 minutes to improve handling and enhance the crinkle effect.
09 - Scoop tablespoon-sized portions of dough and roll into balls. Roll each ball generously in powdered sugar, coating all sides.
10 - Place the dough balls 2 inches apart on the prepared baking sheets.
11 - Bake for 11–13 minutes, or until the edges are just set and the tops have a crinkled appearance.
12 - Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.