Pre-heat your oven to 350° and line a baking sheet with either parchment paper or silicon mats.
Add the softened butter, cream cheese, white and brown sugar to a large bowl and beat until smooth.
Add in the egg and vanilla extract and beat for 3-4 minutes until it's very fluffy.
In a separate bowl, whisk together the flour, corn starch, baking soda, and salt.
Add the dry ingredients into the bowl with the wet ingredients and fold with a spatula just until you see no more loose white flour.
Fold in the chocolate chips.
If you have the time, I would recommend chilling the dough for just 30 minutes, if not, you can go ahead and scoop/bake them but the dough will be stickier and a bit harder to work with.
Scoop 2 tablespoons of dough for each cookie onto your prepared cookie sheet and bake for 11-13 minutes.
When finished baking, allow the cookies to cool on the baking sheet for about 10 minutes before moving them onto a flat plate or cookie rack.