01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl. Set aside.
03 - Beat butter and sugar together until light and fluffy, approximately 2–3 minutes.
04 - Add egg, lemon zest, lemon juice, and vanilla extract, mixing until fully combined.
05 - Gradually add dry ingredients to wet mixture, mixing just until incorporated.
06 - Gently fold in raspberries and white chocolate chips, taking care not to crush the berries.
07 - Drop heaping tablespoons of dough onto prepared baking sheets, spacing 2 inches apart.
08 - Sprinkle with coarse sugar if desired.
09 - Bake for 11–13 minutes until edges are lightly golden and centers are set.
10 - Let cookies rest on baking sheet for 5 minutes, then transfer to wire rack to cool completely.