Heat the oven to 350°. Line a baking sheet with parchment paper. In a large bowl, cream together the sugar, butter, and cream cheese until fluffy. Scrape down the sides, and add the egg and lemon juice and zest. Beat until combined.
In a medium bowl, combine the flour, baking soda, cornstarch, and salt. Beat into the wet mixture just until combined. Gently fold in the blueberries.
Drop tablespoon-sized mounds of dough onto the prepared baking sheet. Bake for 8 to 10 minutes, until the edges are set. Let cool.
Meanwhile, make the glaze: Whisk together the powdered sugar, milk, lemon juice and zest. Drizzle on top of the cookies.
Recipe by Cooking TV Recipes at https://cookingtv-channel.com/blueberry-cream-cheese-cookies/