Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
In a mixing bowl, cream together softened butter and full-fat cream cheese until smooth. Add both sugars and beat until light and fluffy.
Beat in the egg and vanilla extract.
In another bowl, combine flour, baking soda, cornstarch, and salt. Gradually add to the wet mixture and stir until just combined.
Fold in chocolate chips and optional add-ins (nuts, dried fruits).
Chill dough for at least 2 hours to enhance flavor and texture.
Scoop rounded tablespoons of dough onto baking sheets, leaving space between cookies.
Bake for 9-11 minutes until the edges are set but the centers are soft. Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack.
Notes
Use room temperature butter, cream cheese, and eggs for smooth mixing.
Chilling the dough is essential for the best texture and flavor.
Store the cookies in an airtight container at room temperature for up to 5 days or freeze them for up to 3 months.
For a special touch, drizzle with melted chocolate or cream cheese frosting before serving.