01 - Whisk together flour, baking soda, and salt in a medium bowl. Set aside for later use.
02 - Beat softened butter, granulated sugar, and brown sugar in a large mixing bowl until light and fluffy, approximately 2-3 minutes.
03 - Mix in egg, vanilla extract, lemon zest, and lemon juice until fully combined and smooth.
04 - Gradually blend dry ingredients into wet mixture until just incorporated. Avoid overmixing to prevent tough cookies.
05 - Gently fold blueberries into dough. Chill for 30 minutes for easier handling (recommended but optional).
06 - Combine cream cheese and powdered sugar in small bowl until smooth and creamy.
07 - Heat oven to 350°F. Line two baking sheets with parchment paper.
08 - Scoop 2 tablespoons dough, flatten slightly, place 1 teaspoon cheesecake filling in center, and fold dough around to seal completely.
09 - Place filled cookies 2 inches apart on prepared baking sheets. Bake for 11-13 minutes until edges just begin to turn golden.
10 - Let cookies rest on baking sheets for 5 minutes, then transfer to wire rack to cool fully.