Start by preheating your oven to 375 F and measuring all your ingredients.
Crumble the Oreo cookies using a food processor. Pour in the melted butter and pulse until well combined.
Spray a 9-inch round spring-form pan with butter-flavored cooking spray and press the cookie mixture evenly on the bottom. You can use the back of a measuring cup, a spoon, or your hands to make sure it is firmly packed.
Bake this crust for 12-15 mins, remove from the oven, and let it cool completely while you prepare the cheesecake batter. Reduce the heat in the oven to 350 F.
Melt the chocolate chips with the milk in the microwave or in a saucepan over low heat until fully melted. Set aside.
Using a hand-held or electric mixer, beat the cream cheese, sugar, flour, vanilla extract, and salt until smooth. Add the eggs, one at a time, beating after each addition, until smooth.
Mix in the melted chocolate chips and beat until smooth.
Pour the batter into the pan and over the cookie crust. If necessary, use a spatula to even it out.
Bake for 40-50 mins or until a toothpick inserted near the edge comes out clean and the center is just a bit jiggly. Turn the oven off and leave the cheesecake into the oven for one hour with the door ajar.
Transfer the cooler cheesecake to the counter and let cool completely. Refrigerate before serving.