Set your oven to 350°F (175°C). Line a baking sheet with parchment paper or a silicone mat.
In a large bowl, beat softened cream cheese and butter until smooth. Add brown sugar and granulated sugar, and beat for 2–3 minutes until light and fluffy. Mix in the egg and vanilla until fully combined.
In a separate bowl, whisk flour, cornstarch, baking soda, and salt. Gradually add to the wet mixture, mixing on low until just combined. Fold in the chocolate chips.
Scoop 1–1.5 tablespoons of dough, roll into balls, and place 2 inches apart on the baking sheet. Lightly press the tops to flatten slightly.
Bake for 8–10 minutes until edges are golden and centers still look soft. Let them rest on the baking sheet for 5 minutes, then transfer to a wire rack to cool.
Enjoy once cooled with milk, coffee, or tea. Store leftovers in an airtight container to keep them soft.