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 thoroughly combined.
04 - Gradually incorporate dry ingredients into wet mixture, mixing just until flour disappears. Do not overmix.
05 - Gently fold blueberries into dough. If using frozen berries, add directly from freezer. Refrigerate dough for 30 minutes for easier handling.
06 - Blend softened cream cheese and powdered sugar in small bowl until completely smooth.
07 - Set oven to 350°F. Line two baking sheets with parchment paper.
08 - Scoop approximately 2 tablespoons dough, flatten slightly, place 1 teaspoon cheesecake filling in center, and enclose completely by folding dough edges together. Pinch seams to seal.
09 - Place filled cookies 2 inches apart on prepared baking sheets.
10 - Bake for 11-13 minutes until edges are lightly golden. Centers should appear slightly underbaked for optimal chewiness.
11 - Let cookies rest on baking sheets for 5 minutes, then transfer to wire rack to cool fully before serving.