01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking soda, and salt. Set aside.
03 - In a large bowl, beat butter and cream cheese together until smooth and creamy, about 2 minutes.
04 - Add granulated sugar and brown sugar. Beat until light and fluffy.
05 - Mix in the egg, vanilla extract, lemon zest, and lemon juice until combined.
06 - Gradually add the dry ingredients to the wet ingredients, mixing on low speed just until incorporated.
07 - Gently fold in the blueberries with a spatula, being careful not to crush them.
08 - Using a cookie scoop or tablespoon, drop dough onto prepared baking sheets, spacing about 2 inches apart.
09 - Bake for 11–13 minutes, or until edges are lightly golden and centers look set.
10 - Cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.