Preheat the oven to 350 degrees F. Line a 9x13-Inch baking pan with parchment paper or spray with non-stock cooking spray.

In a large mixing bowl, with a hand mixer beat together the chocolate chip cookie mix, butter, and egg until well combined.

Press the cookie dough into the bottom of the prepared pan in an even layer.

Place the Oreos evenly over the top of the cookie dough.

Using a hand mixer, beat together the cream cheese, powdered sugar, and cornstarch in a large mixing bowl until light and fluffy.

Mix in the sour cream until smooth.

Then, add in the eggs, one at a time, mixing just until fully incorporated after each addition.

Fold in ⅔ cup of the chopped Oreos.

Spread the cheesecake mixture evenly across the top of the Oreos in the pan.

Sprinkle the remaining ⅔ cup of chopped Oreos over the top of the cheesecake layer.

Place in the oven and bake for 35-40 minutes or just until the cheesecake layer is just set (around 150 degrees F).

Remove the bars from the oven and place on a wire rack to cool to room temperature.

Cover pan with plastic wrap and refrigerate for at least 3 hours or until fully chilled.

When ready to serve, remove the bars from the pan, cut into squares and serve drizzled with caramel sauce, if desired.