Preheat oven to 350°F (175°C) and line a baking tray with parchment paper.
In a bowl, whisk together flour, baking powder, and salt.
In another bowl, beat butter and sugar until light and fluffy.
Add egg and vanilla extract and mix until combined.
Gradually mix dry ingredients into wet ingredients until dough forms.
In a separate bowl, mix cream cheese and powdered sugar until smooth.
Fold blueberries gently into the cookie dough.
Scoop cookie dough balls, flatten slightly, and add a small spoon of cheesecake filling in the center.
Cover filling with a little extra dough and seal gently.
Place cookies on baking tray and bake for 12–14 minutes until edges are lightly golden.
Cool on the tray for 5 minutes before transferring to a wire rack.
