01 - Preheat oven to 350°F and line two baking sheets with parchment paper.
02 - Whisk together flour, baking soda, and salt in a medium bowl.
03 - Beat softened butter, granulated sugar, and brown sugar until creamy and light, about 2–3 minutes.
04 - Beat in egg, vanilla extract, lemon zest, and lemon juice until well combined.
05 - Gradually add dry ingredients to wet ingredients, mixing until just combined.
06 - Gently fold in blueberries and white chocolate chips, taking care not to crush the berries.
07 - Scoop tablespoon-sized portions of dough onto prepared baking sheets, spacing about 2 inches apart.
08 - Bake for 11–13 minutes until edges are just golden and centers look slightly underbaked.
09 - Allow cookies to cool on baking sheet for 5 minutes before transferring to wire rack to cool completely.