Preheat the oven to 350°F (180°C), or 160°C if using a fan oven. And line two baking sheets with parchment paper or silicone baking mats and set aside.
In a medium bowl, whisk together the flour, baking soda, baking powder, and salt; set aside.
In a separate bowl, cream together the butter, granulated sugar, brown sugar and lemon zest until light and fluffy. Add the egg and vanilla and beat again until the egg is well incorporated/
Add the flour mixture in 2-3 smaller additions, mixing well after each addition. Gently fold in the blueberries, trying not to squish them as they get mixed into dough.
Using a small cookie scoop (1.5 tablespoon) drop cookie dough 2 inches apart on prepared baking sheets.
Bake in the preheated oven for 8-10 minutes, or until lightly golden and no longer wet looking.
Allow to cool 5 minutes before transferring to a wire rack to cool completely.