Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.

In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.

Beat in the egg and vanilla extract until well combined.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Gently fold in the fresh blueberries, being careful not to crush them.

Drop spoonfuls of dough onto the prepared baking sheet, leaving enough space between each cookie for spreading.

Bake in the preheated oven for 10-12 minutes, or until the edges are golden brown.

Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.