01 - Whisk together flour, baking soda, and salt in a medium bowl. Set aside for later use.
02 - In a large mixing bowl, beat softened butter, granulated sugar, and brown sugar until light and fluffy, approximately 2-3 minutes.
03 - Beat in egg, vanilla extract, lemon zest, and lemon juice until fully incorporated and smooth.
04 - Gradually mix in dry ingredients until just combined. Avoid overmixing to prevent tough cookies.
05 - Gently fold blueberries into dough. Refrigerate for at least 30 minutes for best results (recommended but optional).
06 - Mix cream cheese and powdered sugar in small bowl until completely smooth and no lumps remain.
07 - Preheat 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 fold dough around filling to seal completely.
09 - Place stuffed cookies on prepared baking sheets, spacing about 2 inches apart to allow for spreading.
10 - Bake for 11-13 minutes until edges just begin to turn golden. Do not overbake for optimal chewy texture.
11 - Let cookies rest on baking sheets for 5 minutes, then transfer to wire rack to cool completely before serving.