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 incorporate dry ingredients into wet mixture, mixing just until flour disappears. Do not overmix.
05 - Gently fold blueberries into dough. Refrigerate for 30 minutes to prevent excessive spreading during baking.
06 - Blend cream cheese and powdered sugar in small bowl until completely smooth and no lumps remain.
07 - Set oven to 350°F. Line two baking sheets with parchment paper.
08 - Scoop 2 tablespoons dough, flatten in palm, place 1 teaspoon cheesecake filling in center, and fold dough around filling to seal completely.
09 - Place filled cookies 2 inches apart on prepared baking sheets to allow for spreading.
10 - Bake for 11-13 minutes until edges begin turning golden brown. Centers should still appear slightly soft.
11 - Let cookies rest on baking sheets for 5 minutes, then transfer to wire rack to cool entirely before serving.