01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, baking soda, baking powder, and fine sea salt in a medium bowl.
03 - Beat butter, honey, and brown sugar with an electric mixer until creamy and light, about 2–3 minutes.
04 - Add egg and vanilla extract to the butter mixture and beat until fully incorporated.
05 - Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
06 - Fold in chopped pistachios until evenly distributed throughout the dough.
07 - Scoop tablespoon-sized portions of dough onto prepared baking sheets, spacing about 2 inches apart. Lightly flatten each ball of dough.
08 - Sprinkle each cookie with a pinch of flaky sea salt.
09 - Bake for 10–12 minutes, until edges are lightly golden but centers are still soft.
10 - Allow cookies to cool on the sheet for 5 minutes before transferring to a wire rack to cool completely.