01 - Whisk together flour, baking powder, and salt in a medium bowl. Set aside for later use.
02 - Beat softened butter, granulated sugar, and brown sugar in a large bowl until light and fluffy.
03 - Incorporate eggs one at a time, then mix in vanilla extract and lemon zest.
04 - Lightly mash half the blueberries with lemon juice, keeping some berries whole for texture.
05 - Fold the mashed blueberry mixture into the wet ingredients until evenly distributed.
06 - Gradually fold dry ingredients into wet mixture until just combined, being careful not to overmix.
07 - Gently fold in remaining whole blueberries to distribute throughout the dough.
08 - Cover dough and refrigerate for at least 1 hour until firm enough to handle.
09 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
10 - Scoop 1.5 tablespoons of dough, roll into balls, and coat generously in powdered sugar.
11 - Place sugar-coated balls 2 inches apart on prepared baking sheets.
12 - Bake for 11 to 13 minutes until edges are set and tops show characteristic crinkles.
13 - Let cookies rest on baking sheet for 5 minutes, then transfer to wire rack to cool completely.