Preheat your oven to 325. Spray an 8”x8” baking pan with nonstick spray. Set aside.
In a medium sized mixing bowl, beat the sugar and cream cheese until smooth and there is no sugar granules.
In a small bowl, whisk together the milk, cornstarch and salt.
Add the milk mixture to the sugar mixture and stir until combined.
Stir in the egg and egg yolk. Beat on medium speed or by hand for a couple minutes.
Pour the mixture into your prepared baking pan.
Bake for 20 to 25 minutes, or until the mixture is slightly set around the edges but still soft in the middle.
Once the cheesecake filling is cooled completely, fold in the chocolate chips.
You can make this element ahead of time. Store in the refrigerator in an airtight container for up to a week.