01 - Whisk together flour, baking powder, and salt in a medium bowl. Set aside.
02 - Beat softened butter, granulated sugar, and brown sugar in a large bowl until light and fluffy.
03 - Beat in eggs one at a time, then stir in vanilla extract and lemon zest.
04 - Lightly mash half the blueberries with lemon juice, keeping some pieces whole.
05 - Fold the blueberry mixture into the wet ingredients.
06 - Gradually fold dry ingredients into wet mixture until just combined.
07 - Gently fold in remaining whole blueberries.
08 - Cover and refrigerate for at least 1 hour until firm.
09 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
10 - Scoop 1.5 tablespoons dough, roll into balls, and coat generously in powdered sugar.
11 - Place cookies 2 inches apart on prepared baking sheets.
12 - Bake for 11-13 minutes until set at edges and crinkled on top.
13 - Cool on baking sheet for 5 minutes, then transfer to wire rack to cool completely.