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, granulated sugar, and brown sugar in a large bowl until light and creamy, about 2-3 minutes.
04 - Add egg and vanilla extract to butter mixture. Mix until fully combined.
05 - Gradually add dry ingredients to wet mixture, mixing just until no dry streaks remain.
06 - Fold chopped pistachios into dough, reserving 2 tablespoons for topping.
07 - Scoop tablespoonfuls of dough onto prepared baking sheets, spacing at least 2 inches apart.
08 - Press reserved pistachios onto each dough ball and lightly flatten tops.
09 - Bake for 11-13 minutes until edges are golden and centers are just set.
10 - Remove from oven, sprinkle immediately with flaky sea salt. Cool on baking sheet for 5 minutes, then transfer to wire rack.