Preheat oven to 350°F. Line a 9x13” pan with foil and spray with cooking spray.
In a stand mixer fitted with the paddle attachment (or using a hand mixer), combine the red velvet cake mix, 1 egg, and softened butter until a thick cookie dough forms. Press this mixture evenly into the bottom of the prepared pan.
In a separate bowl, beat the cream cheese until smooth. Mix in the granulated sugar until smooth. Add the second egg, sour cream, and vanilla extract and beat until no lumps remain. Stir in the mini chocolate chips. Pour this cheesecake filling over the red velvet crust.
Bake for 30-40 minutes, or until the cheesecake is set around the edges and the center is slightly jiggly. Cool completely to room temperature, then chill in the refrigerator for at least 4 hours (or overnight) before slicing into bars.
Notes
These bars should be stored in an airtight container in the refrigerator for up to five days. They can also be frozen for up to a month.