Preheat your oven to 350°F and line a baking sheet with parchment paper.
In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
In a large mixing bowl, beat the softened butter, granulated sugar, and brown sugar until creamy.
Add the egg and vanilla extract to the butter mixture and mix until well combined.
Incorporate the cream cheese into the mixture until smooth.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Gently fold in the blueberries, lemon zest, and cinnamon if using.
Drop tablespoon-sized balls of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake for 12-15 minutes, or until the edges are lightly golden.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.