Combine butter and cream cheese in a bowl.

Cream together for 1 minute.

Add brown sugar and granulated sugar and continue to mix.

Add egg and vanilla extract and continue to beat on medium to high speed until light and fluffy. (About 5-7 minutes)

Add half the flour, baking soda, salt, cornstarch and the rest of the flour.

Mix to combine, 1 minute.

Stir in chocolate chips until well combined.

Cover and refrigerate dough at least 2-3 hours or up to a few days.

Preheat oven to 350°F.

Prepare baking sheet and spray with cooking spray or parchment paper.

Using a cookie scoop, scoop about 1 1/2 inch to 2 inch cookie dough.

Roll dough into ball, place on sheet and lightly press.

Bake for 8-9 minutes, remove from oven and while still hot, slightly press down.

Allow cookies to cool down before transferring.