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, approximately 2-3 minutes.
03 - Incorporate eggs one at a time, mixing well after each addition. Blend in vanilla extract and lemon zest.
04 - Lightly mash half the blueberries with lemon juice in a small bowl, maintaining some whole pieces for texture.
05 - Fold the mashed blueberry mixture into the butter mixture until evenly distributed.
06 - Gradually fold the flour mixture into the wet ingredients, mixing until just combined. Avoid overmixing.
07 - Gently fold in the remaining whole blueberries to distribute evenly throughout the dough.
08 - Cover bowl and refrigerate dough for minimum 1 hour until firm enough to handle.
09 - Heat oven to 350°F. Line two baking sheets with parchment paper.
10 - Scoop approximately 1.5 tablespoons of dough, roll into balls, and coat generously in powdered sugar.
11 - Place coated dough balls 2 inches apart on prepared baking sheets to allow for spreading.
12 - Bake for 11-13 minutes until edges are set and tops display characteristic crinkles.
13 - Let cookies rest on baking sheet for 5 minutes, then transfer to wire rack to cool completely.