Preheat the oven to 375°F (190°C). Line baking sheets with parchment paper.

In a mixing bowl, whisk together flour, baking powder, and salt.

In a separate bowl, cream together butter and sugar until light and fluffy.

Add egg, vanilla extract, and lemon zest to the creamed mixture. Mix until smooth.

Gradually add the flour mixture to the wet ingredients and mix until just combined.

Fold in blueberries gently until evenly distributed.

Drop rounded portions of dough onto prepared baking sheets, leaving space between each scoop.

Bake for 12 minutes or until the edges turn lightly golden. Centers should look just set.

Let the cookies cool on sheets for a few minutes before transferring to a wire rack.