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