Prepare the Cookie Dough

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper for easy cleanup.
2. Mix the Dry Ingredients: In a small bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
3. Cream the Butter and Sugars: In a large mixing bowl, cream the softened butter, granulated sugar, and brown sugar together until light and fluffy, about 2-3 minutes.
4. Add the Egg and Vanilla: Beat in the egg and vanilla extract until fully combined.
5. Combine Dry and Wet Ingredients: Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix.
6. Fold in the Blueberries: Gently fold in the fresh blueberries, making sure they’re evenly distributed throughout the dough.

Scoop and Bake

1. Scoop the Dough: Use a cookie scoop or a tablespoon to drop rounded portions of dough onto the prepared baking sheet, spacing them about 2 inches apart.
2. Bake: Bake the cookies for 9-10 minutes, or until the edges are lightly golden, and the centers are set but still soft.
3. Cool: Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.