Preheat the oven to 325 degrees. Line an 8-inch square baking dish with parchment paper, allowing a little overhang, then spray the paper and dish with cooking spray.
Make the crust by combining the graham cracker crumbs with the melted butter until mixed thoroughly. Firmly press the mixture into the bottom of the prepared pan.
Bake the crust by placing the baking dish in the oven and baking for 6 minutes. Remove the baking dish and set aside to cool. DO NOT TURN YOUR OVEN OFF.
Meanwhile, prepare the chocolate chip cookie dough by beating the butter, brown sugar, white sugar, salt, and vanilla together using a mixer until creamy and smooth.
Add the flour to the butter mixture until just combined, then add the chocolate chips and mix. Set aside.
Make the cheesecake filling by placing the cream cheese, sugar, egg, and vanilla in a bowl, then use a hand mixer or stand mixer to beat it until creamy and smooth.
Prepare the bars by carefully spreading the cheesecake batter onto the prepared crust.
Using your hand to form clumps, distribute the cookie dough in clumps evenly over the top of the cheesecake batter until you use all of the dough.
Bake the cookie dough bars by placing the baking dish in the oven for 30 minutes, or until the top (cookie dough) feels dry and firm and the entire pan looks set if given a gentle shake.
Move bars to a wire cooling rack and allow them to cool completely.
Lift bars out by the overhang and slice.
Serve cold or at room temperature. Enjoy.
Store leftovers tightly covered in the refrigerator.